Novel cd47 monoclonal antibodies and uses thereof

ABSTRACT

The present invention provides novel CD47 antibodies or immunologically active fragments thereof that have low immunogenicity in humans and cause low or no level of red blood cell depletion or hemagglutination, as well as pharmaceutical compositions containing such antibodies that can be used for treatment diseases mediated by CD47 or inhibition of phagocytosis or platelet aggregation.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to International Application No.PCT/CN2016/102720, filed on Oct. 20, 2016, International Application No.PCT/CN2017/076462, filed on Mar. 13, 2017, and International ApplicationNo. PCT/CN2017/000329, filed on Apr. 27, 2017, the contents of all ofwhich are incorporated herein in their entirety.

BACKGROUND OF THE INVENTION

CD47 (Cluster of Differentiation 47) was first identified as a tumorantigen on human ovarian cancer in the 1980s. Since then, CD47 has beenfound to be expressed on multiple human tumor types including acutemyeloid leukemia (AML), chronic myeloid leukemia, acute lymphoblasticleukemia (ALL), non-Hodgkin's lymphoma (NHL), multiple myeloma (MM),bladder cancer, and other solid tumors. High levels of CD47 allow cancercells to avoid phagocytosis despite having a higher level ofcalreticulin the dominant pro-phagocytic signal.

Also known as integrin-associated protein (IAP), ovarian cancer antigenOA3, Rh-related antigen and MER6, CD47 is a multi-spanning transmembranereceptor belonging to the immunoglobulin superfamily. Its expression andactivity have been implicated in a number of diseases and disorders. Itis a broadly expressed transmembrane glycoprotein with a single Ig-likedomain and five membrane spanning regions, which functions as a cellularligand for SIRPα with binding mediated through the NH₂-terminal V-likedomain of signal-regulatory-protein α (SIRPα). SIRPα is expressedprimarily on myeloid cells, including macrophages, granulocytes, myeloiddendritic cells (DCs), mast cells, and theft precursors, includinghematopoietic stem cells.

Macrophages clear pathogens and damaged or aged cells from the bloodstream via phagocytosis. Cell-surface CD47 interacts with its receptoron macrophages, SIRPα, to inhibit phagocytosis of normal, healthy cells.SIRPα inhibits the phagocytosis of host cells by macrophages, where theligation of SIRPα on macrophages by CD47 expressed on the host targetcell generates an inhibitory signal mediated by SHP-1 that negativelyregulates phagocytosis.

In keeping with the role of CD47 to inhibit phagocytosis of normalcells, there is evidence that it is transiently up-regulated onhematopoietic stem cells (HSCs) and progenitors just prior to and duringtheir migratory phase, and that the level of CD47 on these cellsdetermines the probability that they are engulfed in vivo.

CD47 is also constitutively up-regulated on a number of cancers,including myeloid leukemias. Overexpression of CD47 on a myeloidleukemia line increases its pathogenicity by allowing it to evadephagocytosis. It has been concluded that CD47 up-regulation is animportant mechanism for providing protection to normal HSCs duringinflammation-mediated mobilization, and that leukemic progenitors co-optthis ability in order to evade macrophage killing.

Certain CD47 antibodies have been shown to restore phagocytosis andprevent atherosclerosis. See, e.g., Kojima et al., Nature, Vol. 36,86-90 (Aug. 4, 2016). The present invention provides novel CD47antibodies or immunologically active fragments thereof that have lowimmunogenicity in humans and cause low or no level of red blood celldepletion. As well known to a person skilled in the art, such antibodiesmay be interchangeably called “anti-CD47 antibodies.”

SUMMARY OF THE PRESENT INVENTION

In one aspect, the present invention provides isolated monoclonalantibodies and their immunologically active fragments that bind to humanCD47. For brevity, these CD47-binding isolated monoclonal antibodies andtheir immunologically active fragments are referred to hereinafter as“CD47 antibodies”. The CD47 antibodies of this invention are capable ofmodulating, e.g., blocking, inhibiting, reducing, antagonizing,neutralizing or otherwise interfering with, CD47 expression, activityand/or signaling, or the interaction between CD47 and SIRPα. Verysignificantly, the CD47 antibodies of this invention do not generallycause a significant level of depletion or hemagglutination of human redblood cells, and surprisingly in many cases do not cause any depletionor hemagglutination of human red blood cells at all. Additionally, theCD47 antibodies of this invention have exhibited potent anti-tumoractivities.

In some embodiments, the CD47 antibodies of this invention each include(a) a variable heavy (VH) chain sequence that is at least 90% (e.g., atleast 95%) identical to an amino acid sequence selected from the groupconsisting of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7,SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO:17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23, SEQ ID NO: 25, SEQ IDNO: 27, SEQ ID NO: 29, SEQ ID NO: 31, SEQ ID NO: 33, SEQ ID NO: 35, SEQID NO: 37, SEQ ID NO: 39, SEQ ID NO: 41, SEQ ID NO: 43, SEQ ID NO: 45,SEQ ID NO: 47, SEQ ID NO: 49, SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO:55, SEQ ID NO: 57, SEQ ID NO: 59, SEQ ID NO: 61, SEQ ID NO: 63, SEQ IDNO: 65, SEQ ID NO: 67, SEQ ID NO: 69, SEQ ID NO: 71, SEQ ID NO: 73, SEQID NO: 75, and SEQ ID NO: 77; and (b) a variable light (VL) chainsequence that is at least 90% (e.g., at least 95%) identical to an aminoacid sequence selected from the group consisting of SEQ ID NO: 2, SEQ IDNO: 4, SEQ ID NO: 6, SEQ ID NO: 8, SEQ ID NO: 10, SEQ ID NO: 12, SEQ IDNO: 14, SEQ ID NO: 16, SEQ ID NO: 18, SEQ ID NO: 20, SEQ ID NO: 22, SEQID NO: 24, SEQ ID NO: 26, SEQ ID NO: 28, SEQ ID NO: 30, SEQ ID NO: 32,SEQ ID NO: 34, SEQ ID NO: 36, SEQ ID NO: 38, SEQ ID NO: 40, SEQ ID NO:42, SEQ ID NO: 44, SEQ ID NO: 46, SEQ ID NO: 48, SEQ ID NO: 50, SEQ IDNO: 52, SEQ ID NO: 54, SEQ ID NO: 56, SEQ ID NO: 58, SEQ ID NO: 60, SEQID NO: 62, SEQ ID NO: 64, SEQ ID NO: 66, SEQ ID NO: 68, SEQ ID NO: 70,SEQ ID NO: 72, SEQ ID NO: 74, SEQ ID NO: 76, and SEQ ID NO: 78.

In some other embodiments, the CD47 antibodies of this invention eachinclude paired VH/VL chain sequences that are at least 90% (e.g., atleast 95%, 95%, 96, 97%, 98%, 99%, or 99.5%) identical to a pair of VHand VL amino acid sequences selected from the group consisting of SEQ IDNO: 1 and SEQ ID NO: 2 (i.e., 1A1), SEQ ID NO: 3 and SEQ ID NO: 4 (i.e.,1F8), SEQ ID NO: 5 and SEQ ID NO: 6 (i.e., 2A11), SEQ ID NO: 7 and SEQID NO: 8 (i.e., 2C2), SEQ ID NO: 9 and SEQ ID NO: 10 (i.e., 2D7), SEQ IDNO: 11 and SEQ ID NO: 12 (i.e., 2G4), SEQ ID NO: 13 and SEQ ID NO: 14(i.e., 2G11), SEQ ID NO: 15 and SEQ ID NO: 16 (i.e., 6F4), SEQ ID NO: 17and SEQ ID NO: 18 (i.e., 5H1), SEQ ID NO: 19 and SEQ ID NO: 20 (i.e.,5F6), SEQ ID NO: 21 and SEQ ID NO: 22 (i.e., 1F3), SEQ ID NO: 23 and SEQID NO: 24 (i.e., 2A4), SEQ ID NO: 25 and SEQ ID NO: 26 (i.e., 2B12), SEQID NO: 27 and SEQ ID NO: 28 (i.e., 13A11), SEQ ID NO: 29 and SEQ ID NO:30 (i.e., 15E1), SEQ ID NO: 31 and SEQ ID NO: 32 (i.e., 13H3), SEQ IDNO: 33 and SEQ ID NO: 34 (i.e., 14A8), SEQ ID NO: 35 and SEQ ID NO: 36(i.e., 16H3), SEQ ID NO: 37 and SEQ ID NO: 38 (i.e., 1A1), SEQ ID NO: 39and SEQ ID NO: 40 (i.e., 1A1-A), SEQ ID NO: 41 and SEQ ID NO: 42 (i.e.,1A1-Q), SEQ ID NO: 43 and SEQ ID NO: 44 (i.e., 1A2), SEQ ID NO: 45 andSEQ ID NO: 46 (i.e., 1A8), SEQ ID NO: 47 and SEQ ID NO: 48 (i.e., 1B1),SEQ ID NO: 49 and SEQ ID NO: 50 (i.e., 1B2), SEQ ID NO: 51 and SEQ IDNO: 52 (i.e., 1H3), SEQ ID NO: 53 and SEQ ID NO: 54 (i.e., 1H3-Q), SEQID NO: 55 and SEQ ID NO: 56 (i.e., 1H3-A), SEQ ID NO: 57 and SEQ ID NO:58 (i.e., 2A2), SEQ ID NO: 59 and SEQ ID NO: 60 (i.e., 2A3), SEQ ID NO:61 and SEQ ID NO: 62 (i.e., 2A6), SEQ ID NO: 63 and SEQ ID NO: 64 (i.e.,2A10), SEQ ID NO: 65 and SEQ ID NO: 66 (i.e., 2B1), SEQ ID NO: 67 andSEQ ID NO: 68 (i.e., 2C6), SEQ ID NO: 69 and SEQ ID NO: 70 (i.e., 2E7),SEQ ID NO: 71 and SEQ ID NO: 72 (i.e., 2E9), SEQ ID NO: 73 and SEQ IDNO: 74 (i.e., 2F1), SEQ ID NO: 75 and SEQ ID NO: 76 (i.e., 2F3), and SEQID NO: 77 and SEQ ID NO: 78 (i.e., 34C5). In some instances, the CD47antibodies of this invention each include a pair of VH and VL chainsequences selected from the group consisting of SEQ ID NO: 1 and SEQ IDNO: 2 (i.e., 1A1), SEQ ID NO: 3 and SEQ ID NO: 4 (i.e., 1F8), SEQ ID NO:5 and SEQ ID NO: 6 (i.e., 2A11), SEQ ID NO: 7 and SEQ ID NO: 8 (i.e.,2C2), SEQ ID NO: 9 and SEQ ID NO: 10 (i.e., 2D7), SEQ ID NO: 11 and SEQID NO: 12 (i.e., 2G4), SEQ ID NO: 13 and SEQ ID NO: 14 (i.e., 2G11), SEQID NO: 15 and SEQ ID NO: 16 (i.e., 6F4), SEQ ID NO: 17 and SEQ ID NO: 18(i.e., 5H1), SEQ ID NO: 19 and SEQ ID NO: 20 (i.e., 5F6), SEQ ID NO: 21and SEQ ID NO: 22 (i.e., 1F3), SEQ ID NO: 23 and SEQ ID NO: 24 (i.e.,2A4), SEQ ID NO: 25 and SEQ ID NO: 26 (i.e., 2B12), SEQ ID NO: 27 andSEQ ID NO: 28 (i.e., 13A11), SEQ ID NO: 29 and SEQ ID NO: 30 (i.e.,15E1), SEQ ID NO: 31 and SEQ ID NO: 32 (i.e., 13H3), SEQ ID NO: 33 andSEQ ID NO: 34 (i.e., 14A8), SEQ ID NO: 35 and SEQ ID NO: 36 (i.e.,16H3), SEQ ID NO: 37 and SEQ ID NO: 38 (i.e., 1A1), SEQ ID NO: 39 andSEQ ID NO: 40 (i.e., 1A1-A), SEQ ID NO: 41 and SEQ ID NO: 42 (i.e.,1A1-Q), SEQ ID NO: 43 and SEQ ID NO: 44 (i.e., 1A2), SEQ ID NO: 45 andSEQ ID NO: 46 (i.e., 1A8), SEQ ID NO: 47 and SEQ ID NO: 48 (i.e., 1B1),SEQ ID NO: 49 and SEQ ID NO: 50 (i.e., 1B2), SEQ ID NO: 51 and SEQ IDNO: 52 (i.e., 1H3), SEQ ID NO: 53 and SEQ ID NO: 54 (i.e., 1H3-Q), SEQID NO: 55 and SEQ ID NO: 56 (i.e., 1H3-A), SEQ ID NO: 57 and SEQ ID NO:58 (i.e., 2A2), SEQ ID NO: 59 and SEQ ID NO: 60 (i.e., 2A3), SEQ ID NO:61 and SEQ ID NO: 62 (i.e., 2A6), SEQ ID NO: 63 and SEQ ID NO: 64 (i.e.,2A10), SEQ ID NO: 65 and SEQ ID NO: 66 (i.e., 2B1), SEQ ID NO: 67 andSEQ ID NO: 68 (i.e., 2C6), SEQ ID NO: 69 and SEQ ID NO: 70 (i.e., 2E7),SEQ ID NO: 71 and SEQ ID NO: 72 (i.e., 2E9), SEQ ID NO: 73 and SEQ IDNO: 74 (i.e., 2F1), SEQ ID NO: 75 and SEQ ID NO: 76 (i.e., 2F3), and SEQID NO: 77 and SEQ ID NO: 78 (i.e., 34C5).

The CD47 antibodies of this invention can be chimeric or humanized. Theycan prevent or significantly reduce human CD47 from interacting withSIRPα, or promotes macrophage-mediated phagocytosis of a CD47-expressingcell.

The CD47 antibodies of this invention do not cause a significant ornoticeable level of hemagglutination or depletion of red blood cells,and in many cases they do not cause hemagglutination or depletion of redblood cells at all.

In another aspect, the present invention provides isolated bispecificmonoclonal antibodies. Each of such isolated bispecific monoclonalantibodies comprises a first arm and a second arm, wherein the first armcomprises a first monoclonal antibody or immunologically active fragmentthereof as described above which binds human CD47, and the second armcomprise a second monoclonal antibody that does not bind human CD47.

In some embodiments, the second arm in the isolated bispecificmonoclonal antibodies binds to a cancer cell.

In some other embodiments, the bispecific monoclonal antibodies inhibitinteraction between human CD47 and human SIRPα.

In still another aspect, the present invention provides pharmaceuticalcompositions each containing one of the CD47 antibodies of thisinvention or an isolated bispecific monoclonal antibody of thisinvention, and a pharmaceutically acceptable carrier or excipient.

As used herein, the term “pharmaceutically acceptable carrier orexcipient” refers to a carrier or an excipient that is useful forpreparing a pharmaceutical composition or formulation that is generallysafe, non-toxic, and neither biologically nor otherwise undesirable. Acarrier or excipient employed is typically one suitable foradministration to human subjects or other mammals. In making thecompositions, the active ingredient is usually mixed with, diluted by,or enclosed with a carrier or excipient. When the carrier or excipientserves as a diluent, it can be a solid, semi-solid, or liquid material,which acts as a vehicle, carrier, or medium for the active ingredient ofthe antibody.

Also within the scope of the present invention is a method for treatinga disease in a human subject in need thereof, and the method includesadministering to the subject a therapeutically effective amount of aCD47 antibody of this invention, a bispecific monoclonal antibody ofthis invention, or a pharmaceutical composition of this invention, andthe disease is a cancer, a fibrotic disease, or any disease related toinhibition of phagocytosis. In some instance, the cancer can be selectedfrom the group consisting of ovarian cancer, colon cancer, breastcancer, lung cancer, head and neck cancer, bladder cancer, colorectalcancer, pancreatic cancer, non-Hodgkin's lymphoma, acute lymphocyticleukemia, chronic lymphocytic leukemia, acute myeloid leukemia, chronicmyelogenous leukemia, hairy cell leukemia (HCL), T-cell prolymphocyticleukemia (T-PLL), large granular lymphocytic leukemia, adult T-cellleukemia, multiple myeloma, melanoma, leiomyoma, leiomyosarcoma, glioma,glioblastoma, myelomas, monocytic leukemias, B-cell derived leukemias,T-cell derived leukemias, B-cell derived lymphomas, T-cell derivedlymphomas, endometrial cancer, kidney cancer, melanoma, prostate cancer,thyroid cancer, cervical cancer, gastric cancer, liver cancer, and solidtumors; whereas the fibrotic disease can be selected from the groupconsisting of myocardial infarction, angina, osteoarthritis, pulmonaryfibrosis, asthma, cystic fibrosis, bronchitis, and asthma. Examples ofsolid tumors include, e.g., endometrial cancer, thyroid cancer, cervicalcancer, gastric cancer, breast tumors, ovarian tumors, lung tumors,pancreatic tumors, prostate tumors, melanoma tumors, colorectal tumors,lung tumors, head and neck tumors, bladder tumors, esophageal tumors,liver tumors, and kidney tumors, and neuroblastic-derived CNS tumors.The disease related to inhibition of phagocytosis can be acardiovascular disease (e.g., atherosclerosis, stroke, hypertensiveheart disease, rheumatic heart disease, cardiomyopathy, heartarrhythmia, congenital heart disease, valvular heart disease, carditis,aortic aneurysms, peripheral artery disease, or venous thrombosis).

As used herein, the term “effective amount” refers to that amount of aCD47 antibody sufficient or required to effect treatment, prognosis ordiagnosis of a disease associated with CD47 dependent signaling, asdescribed herein, when administered to a subject. Therapeuticallyeffective amounts of antibodies provided herein, when used alone or incombination, will vary depending upon the relative activity of theantibodies (e.g., promoting macrophage mediated phagocytosis of cancercells expressing CD47) and depending upon the subject and diseasecondition being treated, the weight and age of the subject, the severityof the disease condition, the manner of administration and the like,which can readily be determined by one of ordinary skill in the art.

As used herein, the term “isolated” preceding a CD47 antibody of thisinvention means that the antibody is substantially free of othercellular material. In one embodiment, an isolated antibody issubstantially free of other proteins from the same species. In anotherembodiment, an isolated antibody is expressed by a cell from a differentspecies and is substantially free of other proteins from the differentspecies. A protein may be rendered substantially free of naturallyassociated components (or components associated with the cellularexpression system used to produce the antibody) by isolation, usingprotein purification techniques well known in the art. In oneembodiment, the antibodies, or antigen binding fragments, of theinvention are isolated.

Still within the scope of this invention are fusion proteins eachcomprising a first amino acid sequence and a second amino acid sequence,wherein the first amino acid sequence is SEQ ID NO: 1, SEQ ID NO: 3, SEQID NO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQID NO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23,SEQ ID NO: 25, SEQ ID NO: 27, SEQ ID NO: 29, SEQ ID NO: 31, SEQ ID NO:33, SEQ ID NO: 35, SEQ ID NO: 37, SEQ ID NO: 39, SEQ ID NO: 41, SEQ IDNO: 43, SEQ ID NO: 45, SEQ ID NO: 47, SEQ ID NO: 49, SEQ ID NO: 51, SEQID NO: 53, SEQ ID NO: 55, SEQ ID NO: 57, SEQ ID NO: 59, SEQ ID NO: 61,SEQ ID NO: 63, SEQ ID NO: 65, SEQ ID NO: 67, SEQ ID NO: 69, SEQ ID NO:71, SEQ ID NO: 73, SEQ ID NO: 75, or SEQ ID NO: 77, or an amino acidsequence that is at least 90% (e.g., at least 95%) identical thereto;and the second amino acid sequence is SEQ ID NO: 2, SEQ ID NO: 4, SEQ IDNO: 6, SEQ ID NO: 8, SEQ ID NO: 10, SEQ ID NO: 12, SEQ ID NO: 14, SEQ IDNO: 16, SEQ ID NO: 18, SEQ ID NO: 20, SEQ ID NO: 22, SEQ ID NO: 24, SEQID NO: 26, SEQ ID NO: 28, SEQ ID NO: 30, SEQ ID NO: 32, SEQ ID NO: 34,SEQ ID NO: 36, SEQ ID NO: 38, SEQ ID NO: 40, SEQ ID NO: 42, SEQ ID NO:44, SEQ ID NO: 46, SEQ ID NO: 48, SEQ ID NO: 50, SEQ ID NO: 52, SEQ IDNO: 54, SEQ ID NO: 56, SEQ ID NO: 58, SEQ ID NO: 60, SEQ ID NO: 62, SEQID NO: 64, SEQ ID NO: 66, SEQ ID NO: 68, SEQ ID NO: 70, SEQ ID NO: 72,SEQ ID NO: 74, SEQ ID NO: 76, or SEQ ID NO: 78, or an amino acidsequence that is at least 90% (e.g., at least 95%) identical thereto.

In some embodiments, a fusion protein of this invention includes acombination of the first amino acid sequence and the second amino acidsequence, and the combination of these two amino acid sequences is SEQID NO: 1 and SEQ ID NO: 2 (i.e., 1A1), SEQ ID NO: 3 and SEQ ID NO: 4(i.e., 1F8), SEQ ID NO: 5 and SEQ ID NO: 6 (i.e., 2A11), SEQ ID NO: 7and SEQ ID NO: 8 (i.e., 2C2), SEQ ID NO: 9 and SEQ ID NO: 10 (i.e.,2D7), SEQ ID NO: 11 and SEQ ID NO: 12 (i.e., 2G4), SEQ ID NO: 13 and SEQID NO: 14 (i.e., 2G11), SEQ ID NO: 15 and SEQ ID NO: 16 (i.e., 6F4), SEQID NO: 17 and SEQ ID NO: 18 (i.e., 5H1), SEQ ID NO: 19 and SEQ ID NO: 20(i.e., 5F6), SEQ ID NO: 21 and SEQ ID NO: 22 (i.e., 1F3), SEQ ID NO: 23and SEQ ID NO: 24 (i.e., 2A4), SEQ ID NO: 25 and SEQ ID NO: 26 (i.e.,2E312), SEQ ID NO: 27 and SEQ ID NO: 28 (i.e., 13A11), SEQ ID NO: 29 andSEQ ID NO: 30 (i.e., 15E1), SEQ ID NO: 31 and SEQ ID NO: 32 (i.e.,13H3), SEQ ID NO: 33 and SEQ ID NO: 34 (i.e., 14A8), SEQ ID NO: 35 andSEQ ID NO: 36 (i.e., 16H3), SEQ ID NO: 37 and SEQ ID NO: 38 (i.e., 1A1),SEQ ID NO: 39 and SEQ ID NO: 40 (i.e., 1A1-A), SEQ ID NO: 41 and SEQ IDNO: 42 (i.e., 1A1-Q), SEQ ID NO: 43 and SEQ ID NO: 44 (i.e., 1A2), SEQID NO: 45 and SEQ ID NO: 46 (i.e., 1A8), SEQ ID NO: 47 and SEQ ID NO: 48(i.e., 1B1), SEQ ID NO: 49 and SEQ ID NO: 50 (i.e., 1B2), SEQ ID NO: 51and SEQ ID NO: 52 (i.e., 1H3), SEQ ID NO: 53 and SEQ ID NO: 54 (i.e.,1H3-Q), SEQ ID NO: 55 and SEQ ID NO: 56 (i.e., 1H3-A), SEQ ID NO: 57 andSEQ ID NO: 58 (i.e., 2A2), SEQ ID NO: 59 and SEQ ID NO: 60 (i.e., 2A3),SEQ ID NO: 61 and SEQ ID NO: 62 (i.e., 2A6), SEQ ID NO: 63 and SEQ IDNO: 64 (i.e., 2A10), SEQ ID NO: 65 and SEQ ID NO: 66 (i.e., 2B1), SEQ IDNO: 67 and SEQ ID NO: 68 (i.e., 2C6), SEQ ID NO: 69 and SEQ ID NO: 70(i.e., 2E7), SEQ ID NO: 71 and SEQ ID NO: 72 (i.e., 2E9), SEQ ID NO: 73and SEQ ID NO: 74 (i.e., 2F1), SEQ ID NO: 75 and SEQ ID NO: 76 (i.e.,2F3), SEQ ID NO: 77 and SEQ ID NO: 78 (i.e., 34C5), or a combinationthat is at least 90% (e.g., at least 95%) identical thereto for each ofthe first and second amino acid sequences.

In some other embodiments, a fusion protein of this invention includes acombination of the first amino acid sequence and the second amino acidsequence, and the combination of these two amino acid sequences is SEQID NO: 1 and SEQ ID NO: 2 (i.e., 1A1), SEQ ID NO: 3 and SEQ ID NO: 4(i.e., 1F8), SEQ ID NO: 5 and SEQ ID NO: 6 (i.e., 2A11), SEQ ID NO: 7and SEQ ID NO: 8 (i.e., 2C2), SEQ ID NO: 9 and SEQ ID NO: 10 (i.e.,2D7), SEQ ID NO: 11 and SEQ ID NO: 12 (i.e., 2G4), SEQ ID NO: 13 and SEQID NO: 14 (i.e., 2G11), SEQ ID NO: 15 and SEQ ID NO: 16 (i.e., 6F4), SEQID NO: 17 and SEQ ID NO: 18 (i.e., 5H1), SEQ ID NO: 19 and SEQ ID NO: 20(i.e., 5F6), SEQ ID NO: 21 and SEQ ID NO: 22 (i.e., 1F3), SEQ ID NO: 23and SEQ ID NO: 24 (i.e., 2A4), SEQ ID NO: 25 and SEQ ID NO: 26 (i.e.,2B12), SEQ ID NO: 27 and SEQ ID NO: 28 (i.e., 13A11), SEQ ID NO: 29 andSEQ ID NO: 30 (i.e., 15E1), SEQ ID NO: 31 and SEQ ID NO: 32 (i.e.,13H3), SEQ ID NO: 33 and SEQ ID NO: 34 (i.e., 14A8), SEQ ID NO: 35 andSEQ ID NO: 36 (i.e., 16H3), SEQ ID NO: 37 and SEQ ID NO: 38 (i.e., 1A1),SEQ ID NO: 39 and SEQ ID NO: 40 (i.e., 1A1-A), SEQ ID NO: 41 and SEQ IDNO: 42 (i.e., 1A1-Q), SEQ ID NO: 43 and SEQ ID NO: 44 (i.e., 1A2), SEQID NO: 45 and SEQ ID NO: 46 (i.e., 1A8), SEQ ID NO: 47 and SEQ ID NO: 48(i.e., 1B1), SEQ ID NO: 49 and SEQ ID NO: 50 (i.e., 1B2), SEQ ID NO: 51and SEQ ID NO: 52 (i.e., 1H3), SEQ ID NO: 53 and SEQ ID NO: 54 (i.e.,1H3-Q), SEQ ID NO: 55 and SEQ ID NO: 56 (i.e., 1H3-A), SEQ ID NO: 57 andSEQ ID NO: 58 (i.e., 2A2), SEQ ID NO: 59 and SEQ ID NO: 60 (i.e., 2A3),SEQ ID NO: 61 and SEQ ID NO: 62 (i.e., 2A6), SEQ ID NO: 63 and SEQ IDNO: 64 (i.e., 2A10), SEQ ID NO: 65 and SEQ ID NO: 66 (i.e., 2B1), SEQ IDNO: 67 and SEQ ID NO: 68 (i.e., 2C6), SEQ ID NO: 69 and SEQ ID NO: 70(i.e., 2E7), SEQ ID NO: 71 and SEQ ID NO: 72 (i.e., 2E9), SEQ ID NO: 73and SEQ ID NO: 74 (i.e., 2F1), SEQ ID NO: 75 and SEQ ID NO: 76 (i.e.,2F3), or SEQ ID NO: 77 and SEQ ID NO: 78 (i.e., 34C5).

In still some other embodiments, a fusion protein of this invention canfurther include an additional protein—in addition to the first andsecond amino acid sequences. The additional protein is an antibody or acytokine.

In yet still some other embodiments, a fusion protein of this inventioncan be conjugated with a small-molecule therapeutic agent (e.g.,anti-cancer or anti-inflammation agent) or a marker (e.g., a biomarkeror fluorescent marker).

In yet another aspect, the present invention provides immunodominantepitopes encoded by the CD47 gene comprising a recombinant proteincontaining conformationally a TNMEAQ loop (residues 26-31), T34, E35,L74, and an LTR hinge (residues 101-103) of CD47.

In yet still another aspect, the present invention provides biologicalmolecules that specifically bind to a conformational epitope having anamino acid sequence comprising a TNMEAQ loop (residues 26-31), T34, E35,L74, and an LTR hinge (residues 101-103) of CD47, wherein the antibodycan specifically bind to CD47.

As used herein, the term “biological molecules” is meant to includesynthetic antibodies (monoclonal or bispecific), peptides, andbiomimetic molecules. The term “biomimetic molecules” refers tomolecules which are designed or developed to have structures orproperties similar to or resembling those of naturally occurring largecompounds such as proteins or nucleotides and which have a molecularweight of, e.g., at least 3,000, at least 5,000, or at least 10,000.

All references cited herein are incorporated by reference in theirentirety.

BRIEF DESCRIPTIONS OF THE DRAWINGS

FIG. 1 shows dose-dependent response of CD47 antibodies binding tomonomeric CD47-ECD.

FIG. 2a and FIG. 2b show dose-dependent response of CD47 antibodiesbinding to dimeric CD47-ECD.

FIG. 3a , FIG. 3b , and FIG. 3c dose-dependent response of CD47antibodies blocking the binding of CD47 to SIRPα.

FIG. 4a and FIG. 4b show dose-dependent response of CD47 antibodiesbinding to CD47+ Raji cells; and FIG. 4c , FIG. 4d and FIG. 4e showbinding kinetics and data of CD47 antibodies as measured by Biocoreanalysis.

FIG. 5a and FIG. 5b show phagocytosis of tumor cells by human Mϕ withCD47 antibodies.

FIGS. 6a-6c show macrophage-mediated phagocytosis of various human bloodcancer cell lines triggered by CD47 antibodies.

FIGS. 7a and 7b show red blood cells (RBC)-sparing properties in RBCagglutination assay with CD47 antibodies.

FIGS. 8a, 8b, 8c, and 8d show activities to bind RBC and induce RBCagglutination by CD antibodies at different and higher doses.

FIGS. 9a, 9b, 9c, and 9d show RBC-binding activities of CD47 antibodies.

FIG. 10 shows results of red blood cell agglutination across multiplehuman blood samples induced by CD47 antibodies.

FIG. 11 shows the human platelet binding activities of CD47 antibodiesand SIRPa-Ig fusion, with CD61 stained as a surface marker forplatelets.

FIG. 12 shows the test results of cyno red blood cell agglutinationinduced by CD47 antibodies and SIRPa-Ig fusion in vitro.

FIG. 13 shows the test results of phagocytosis and AML cells binding byCD47 antibodies and control.

FIG. 14a and FIG. 14b show the efficacy of treatments with CD47antibodies and control on luciferase-Raji xenograft mice.

FIG. 15 shows the polarization of macrophage in tumor-bearing miceinduced by CD47 antibodies and control.

FIG. 16 shows the CD47 expression profiles using PDX samples of varioushuman cancer types.

FIG. 17 shows results of safety pharm study (hematology) in cynomolgusmonkeys.

FIG. 18 shows completion in binding of CD47 between antibodies 1F8 and5F9, and between antibodies 1F8 and 2A1, due to their differentepitopes, and structures of the 5F9/CD47 complex and the 1F8/CD47complex.

FIGS. 19a, 19b, 19c, 19d, 19e, 19f, 19g, and 19h show the effects of theCD47 antibody 13H3 on RBC congregation, hemoglobin, platelets, andlymphocytes, respectively.

FIG. 20 shows strong binding affinity of 34C5 to recombinant CD47-ECD.

FIG. 21 shows strong binding affinity of 34C5 to CD47-bearing Rajicells.

FIG. 22 shows that 34C5 was able to effectively block CD47 binding toSIRPα, with an EC₅₀ of 0.30 nM.

FIG. 23 shows that the antibody 34C5 promoted phagocystosis of tumorcells by human Mϕ.

FIG. 24 shows the antibody 34C5 did not cause in vitro RBCagglutination.

FIG. 25 shows the antibody 34C5 decrease its binding to RBC with thedecreasing concentration of this antibody.

FIG. 26 shows amino acid sequences of some CD47 antibodies of thisinvention and their respective nucleotide sequences.

FIG. 27 shows the amino acid sequence for CD47 Immunoglobulin-likedomain (Ig-V) 19-141.

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides novel isolated monoclonal CD47 antibodiesthat can prevent human CD47 from interacting with SIRPα, or promotemacrophage-mediated phagocytosis of a CD47-expressing cell. These CD47antibodies do not cause a significant or noticeable level ofhemagglutination or depletion of red blood cells, and in many cases theydo not cause hemagglutination or depletion of red blood cells at all.

As examples, a CD47 antibodies of this invention would include (a) avariable heavy (VH) chain sequence that is at least 90% (e.g., at least95%) identical to an amino acid sequence selected from the groupconsisting of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 5, SEQ ID NO: 7,SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ ID NO: 15, SEQ ID NO:17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23, SEQ ID NO: 25, SEQ IDNO: 27, SEQ ID NO: 29, SEQ ID NO: 31, SEQ ID NO: 33, SEQ ID NO: 35, SEQID NO: 37, SEQ ID NO: 39, SEQ ID NO: 41, SEQ ID NO: 43, SEQ ID NO: 45,SEQ ID NO: 47, SEQ ID NO: 49, SEQ ID NO: 51, SEQ ID NO: 53, SEQ ID NO:55, SEQ ID NO: 57, SEQ ID NO: 59, SEQ ID NO: 61, SEQ ID NO: 63, SEQ IDNO: 65, SEQ ID NO: 67, SEQ ID NO: 69, SEQ ID NO: 71, SEQ ID NO: 73, SEQID NO: 75, and SEQ ID NO: 77; and (b) a variable light (VL) chainsequence that is at least 90% (e.g., at least 95%) identical to an aminoacid sequence selected from the group consisting of SEQ ID NO: 2, SEQ IDNO: 4, SEQ ID NO: 6, SEQ ID NO: 8, SEQ ID NO: 10, SEQ ID NO: 12, SEQ IDNO: 14, SEQ ID NO: 16, SEQ ID NO: 18, SEQ ID NO: 20, SEQ ID NO: 22, SEQID NO: 24, SEQ ID NO: 26, SEQ ID NO: 28, SEQ ID NO: 30, SEQ ID NO: 32,SEQ ID NO: 34, SEQ ID NO: 36, SEQ ID NO: 38, SEQ ID NO: 40, SEQ ID NO:42, SEQ ID NO: 44, SEQ ID NO: 46, SEQ ID NO: 48, SEQ ID NO: 50, SEQ IDNO: 52, SEQ ID NO: 54, SEQ ID NO: 56, SEQ ID NO: 58, SEQ ID NO: 60, SEQID NO: 62, SEQ ID NO: 64, SEQ ID NO: 66, SEQ ID NO: 68, SEQ ID NO: 70,SEQ ID NO: 72, SEQ ID NO: 74, SEQ ID NO: 76, and SEQ ID NO: 78. In somefurther instance, a CD47 antibodies of this invention would include acombined VH/VL chain sequence that is at least 90% (e.g., at least 95%)identical to an amino acid sequence selected from the group consistingof SEQ ID NO: 1 and SEQ ID NO: 2, SEQ ID NO: 3 and SEQ ID NO: 4, SEQ IDNO: 5 and SEQ ID NO: 6, SEQ ID NO: 7 and SEQ ID NO: 8, SEQ ID NO: 9 andSEQ ID NO: 10, SEQ ID NO: 11 and SEQ ID NO: 12, SEQ ID NO: 13 and SEQ IDNO: 14, SEQ ID NO: 15 and SEQ ID NO: 16, SEQ ID NO: 17 and SEQ ID NO:18, SEQ ID NO: 19 and SEQ ID NO: 20, SEQ ID NO: 21 and SEQ ID NO: 22,SEQ ID NO: 23 and SEQ ID NO: 24, SEQ ID NO: 25 and SEQ ID NO: 26, SEQ IDNO: 27 and SEQ ID NO: 28, SEQ ID NO: 29 and SEQ ID NO: 30, SEQ ID NO: 31and SEQ ID NO: 32, SEQ ID NO: 33 and SEQ ID NO: 34, SEQ ID NO: 35 andSEQ ID NO: 36, SEQ ID NO: 37 and SEQ ID NO: 38, SEQ ID NO: 39 and SEQ IDNO: 40, SEQ ID NO: 41 and SEQ ID NO: 42, SEQ ID NO: 43 and SEQ ID NO:44, SEQ ID NO: 45 and SEQ ID NO: 46, SEQ ID NO: 47 and SEQ ID NO: 48,SEQ ID NO: 49 and SEQ ID NO: 50, SEQ ID NO: 51 and SEQ ID NO: 52, SEQ IDNO: 53 and SEQ ID NO: 54, SEQ ID NO: 55 and SEQ ID NO: 56, SEQ ID NO: 57and SEQ ID NO: 58, SEQ ID NO: 59 and SEQ ID NO: 60, SEQ ID NO: 61 andSEQ ID NO: 62, SEQ ID NO: 63 and SEQ ID NO: 64, SEQ ID NO: 65 and SEQ IDNO: 66, SEQ ID NO: 67 and SEQ ID NO: 68, SEQ ID NO: 69 and SEQ ID NO:70, SEQ ID NO: 71 and SEQ ID NO: 72, SEQ ID NO: 73 and SEQ ID NO: 74,SEQ ID NO: 75 and SEQ ID NO: 76, and SEQ ID NO: 77 and SEQ ID NO: 78.

As used herein, the term “antibody” is used in the broadest sense andspecifically covers monoclonal antibodies (including full lengthmonoclonal antibodies), polyclonal antibodies, mufti-specific antibodies(e.g., bispecific antibodies), and antibody fragments so long as theyexhibit the desired biological activity. “Antibodies” (or “Abs”) and“immunoglobulins” (or “Igs”) are glycoproteins having the samestructural characteristics. While antibodies exhibit binding specificityto a specific antigen, immunoglobulins include both antibodies and otherantibody-like molecules which lack antigen specificity. Polypeptides ofthe latter kind are, for example, produced at low levels by the lymphsystem and at increased levels by myelomas.

As used herein, the term “epitope” means any antigenic determinant on anantigen to which the paratope of an antibody binds. Epitopicdeterminants usually consist of chemically active surface groupings ofmolecules such as amino acids or sugar side chains and usually havespecific three dimensional structural characteristics, as well asspecific charge characteristics.

As used herein, the term “native antibodies and immunoglobulins” areusually heterotetrameric glycoproteins of about 150,000 daltons,composed of two identical light (L) chains and two identical heavy (H)chains. Each light chain is linked to a heavy chain by one covalentdisulfide bond (also termed a “VH/VL pair”), while the number ofdisulfide linkages varies between the heavy chains of differentimmunoglobulin isotypes. Each heavy and light chain also has regularlyspaced intrachain disulfide bridges. Each heavy chain has at one end avariable domain (VH) followed by a number of constant domains. Eachlight chain has a variable domain at one end (VL) and a constant domainat its other end; the constant domain of the light chain is aligned withthe first constant domain of the heavy chain, and the light chainvariable domain is aligned with the variable domain of the heavy chain.Particular amino acid residues are believed to form an interface betweenthe light- and heavy-chain variable domains. See, e.g., Clothia et al.,J. Mol. Biol., 186:651 (1985); Novotny and Haber, Proc. Natl. Acad. Sci.U.S.A., 82:4592 (1985).

As used herein, the term “variable” refers to the fact that certainportions of the variable domains differ extensively in sequence amongantibodies and are used in the binding and specificity of eachparticular antibody for its particular antigen. However, the variabilityis not evenly distributed throughout the variable domains of antibodies.It is concentrated in three segments called complementarity-determiningregions (CDRs) or hypervariable regions both in the light-chain and theheavy-chain variable domains. The more highly conserved portions ofvariable domains are called the framework (FR). The variable domains ofnative heavy and light chains each comprise four FR regions, largelyadopting a β-sheet configuration, connected by three CDRs, which formloops connecting, and in some cases forming part of, the β-sheetstructure. The CDRs in each chain are held together in close proximityby the FR regions and, with the CDRs from the other chain, contribute tothe formation of the antigen-binding site of antibodies. See, e.g.,Kabat et al., Sequences of Proteins of Immunological Interest, FifthEdition, National Institute of Health, Bethesda, Md. (1991). Theconstant domains are not involved directly in binding an antibody to anantigen, but exhibit various effector functions, such as participationof the antibody in antibody-dependent cellular toxicity. Variable regionsequences of interest include the provided humanized variable regionsequences for CD47 antibodies. For instance, 1A1 includes SEQ ID NO: 1(heavy) and SEQ ID NO: 2 (light), 1F8 includes SEQ ID NO: 3 (heavy) andSEQ ID NO: 4 (light), and 2A11 includes SEQ ID NO: 5 (heavy) and SEQ IDNO: 6 (light).

Papain digestion of antibodies produces two identical antigen-bindingfragments, called “Fab” fragments, each with a single antigen-bindingsite, and a residual “Fc” fragment, whose name reflects its ability tocrystallize readily. Pepsin treatment yields an F(ab′)2 fragment thathas two antigen-combining sites and is still capable of cross-linkingantigen. “Fv” is the minimum antibody fragment which contains a completeantigen-recognition and -binding site. In a two-chain Fv species, thisregion consists of a dimer of one heavy- and one light-chain variabledomain in tight, non-covalent association. In a single-chain Fv species(scFv), one heavy- and one light-chain variable domain can be covalentlylinked by a flexible peptide linker such that the light and heavy chainscan associate in a “dimeric” structure analogous to that in a two-chainFv species. It is in this configuration that the three CDRs of eachvariable domain interact to define an antigen-binding site on thesurface of the VH-VL dimer. Collectively, the six CDRs conferantigen-binding specificity to the antibody. However, even a singlevariable domain (or half of an Fv comprising only three CDRs specificfor an antigen) has the ability to recognize and bind antigen, althoughat a lower affinity than the entire binding site. See, e.g., Pluckthun,in The Pharmacology of Monoclonal Antibodies, Vol. 113, Rosenburg andMoore eds., Springer-Verlag, New York, pp. 269-315 (1994).

The Fab fragment also contains the constant domain of the light chainand the first constant domain (CH₁) of the heavy chain. Fab′ fragmentsdiffer from Fab fragments by the addition of a few residues at thecarboxy terminus of the heavy chain CH₁ domain including one or morecysteines from the antibody hinge region. Fab′-SH is the designationherein for Fab′ in which the cysteine residue(s) of the constant domainsbear a free thiol group. F(ab′)₂ antibody fragments originally wereproduced as pairs of Fab′ fragments which have hinge cysteines betweenthem. Other chemical couplings of antibody fragments are also known.

There are five major classes of immunoglobulins: IgA, IgD, IgE, IgG, andIgM, and several of these can be further divided into subclasses(isotypes), e.g., IgG1, IgG2, IgG3, IgG4, IgA1, IgA2. The heavy-chainconstant domains that correspond to the different classes ofimmunoglobulins are called α, δ, ε, γ, and μ, respectively. The subunitstructures and three-dimensional configurations of different classes ofimmunoglobulins are well known.

As used herein, the term “antibody fragment”, and all grammaticalvariants thereof, are defined as a portion of an intact antibodycomprising the antigen binding site or variable region of the intactantibody, wherein the portion is free of the constant heavy chaindomains (i.e. CH2, CH3, and CH4, depending on antibody isotype) of theFc region of the intact antibody. Examples of antibody fragments includeFab, Fab′, Fab′-SH, F(ab′)₂, and Fv fragments; diabodies; any antibodyfragment that is a polypeptide having a primary structure consisting ofone uninterrupted sequence of contiguous amino acid residues (referredto herein as a “single-chain antibody fragment” or “single chainpolypeptide.”), including without limitation (1) single-chain Fv (scFv)molecules, (2) single chain polypeptides containing only one light chainvariable domain, or a fragment thereof that contains the three CDRs ofthe light chain variable domain, without an associated heavy chainmoiety, and (3) single chain polypeptides containing only one heavychain variable region, or a fragment thereof containing the three CDRsof the heavy chain variable region, without an associated light chainmoiety; and mufti-specific or multivalent structures formed fromantibody fragments. In an antibody fragment comprising one or more heavychains, the heavy chain(s) can contain any constant domain sequence(e.g. CH1 in the IgG isotype) found in a non-Fc region of an intactantibody, and/or can contain any hinge region sequence found in anintact antibody, and/or can contain a leucine zipper sequence fused toor situated in the hinge region sequence or the constant domain sequenceof the heavy chain(s).

Unless specifically indicated to the contrary, the term “conjugate” usedherein is defined as a heterogeneous molecule formed by the covalentattachment of one or more antibody fragment(s) to one or more polymermolecule(s), wherein the heterogeneous molecule is water soluble, i.e.soluble in physiological fluids such as blood, and wherein theheterogeneous molecule is free of any structured aggregate. A conjugateof interest is polyethylenglycol (PEG). In the context of the foregoingdefinition, the term “structured aggregate” refers to (1) any aggregateof molecules in aqueous solution having a spheroid or spheroid shellstructure, such that the heterogeneous molecule is not in a micelle orother emulsion structure, and is not anchored to a lipid bilayer,vesicle or liposome; and (2) any aggregate of molecules in solid orinsolubilized form, such as a chromatography bead matrix, that does notrelease the heterogeneous molecule into solution upon contact with anaqueous phase. Accordingly, the term “conjugate” as defined hereinencompasses the aforementioned heterogeneous molecule in a precipitate,sediment, bioerodible matrix or other solid capable of releasing theheterogeneous molecule into aqueous solution upon hydration of thesolid.

As used herein, the term “monoclonal antibody” (mAb) refers to anantibody obtained from a population of substantially homogeneousantibodies, i.e., the individual antibodies comprising the populationare identical except for possible naturally occurring mutations that maybe present in minor amounts. Monoclonal antibodies are highly specific,being directed against a single antigenic site. Each mAb is directedagainst a single determinant on the antigen. In addition to theirspecificity, the monoclonal antibodies are advantageous in that they canbe synthesized by hybridoma culture, uncontaminated by otherimmunoglobulins. The modifier “monoclonal” indicates the character ofthe antibody as being obtained from a substantially homogeneouspopulation of antibodies, and is not to be construed as requiringproduction of the antibody by any particular method. For example, themonoclonal antibodies to be used in accordance with the presentinvention may be made in an immortalized B cell or hybridoma thereof, ormay be made by recombinant DNA methods.

The monoclonal antibodies herein include hybrid and recombinantantibodies produced by splicing a variable (including hypervariable)domain of an CD47 antibody with a constant domain (e.g. “humanized”antibodies), or a light chain with a heavy chain, or a chain from onespecies with a chain from another species, or fusions with heterologousproteins, regardless of species of origin or immunoglobulin class orsubclass designation, as well as antibody fragments (e.g., Fab, F(ab′)₂,and Fv), so long as they exhibit the desired biological activity.

The monoclonal antibodies herein specifically include “chimeric”antibodies (immunoglobulins) in which a portion of the heavy and/orlight chain is identical with or homologous to corresponding sequencesin antibodies derived from a particular species or belonging to aparticular antibody class or subclass, while the remainder of thechain(s) is identical with or homologous to corresponding sequences inantibodies derived from another species or belonging to another antibodyclass or subclass, as well as fragments of such antibodies, so long asthey exhibit the desired biological activity.

As used herein, an “isolated” antibody is one which has been identifiedand separated and/or recovered from a component of its naturalenvironment. Contaminant components of its natural environment arematerials which would interfere with diagnostic or therapeutic uses forthe antibody, and may include enzymes, hormones, and other proteinaceousor nonproteinaceous solutes. In some embodiments, the antibody will bepurified (1) to greater than 75% by weight of antibody as determined bythe Lowry method, and most preferably more than 80%, 90% or 99% byweight, or (2) to homogeneity by SOS-PAGE under reducing or nonreducingconditions using Coomassie blue or, preferably, silver stain. Isolatedantibody includes the antibody in situ within recombinant cells since atleast one component of the antibody's natural environment will not bepresent. Ordinarily, however, isolated antibody will be prepared by atleast one purification step.

As used herein, the term “epitope tagged” refers to a CD47 antibodyfused to an “epitope tag”. The epitope tag polypeptide has enoughresidues to provide an epitope against which an antibody can be made,yet is short enough such that it does not interfere with activity of theCD47 antibody. The epitope tag preferably is sufficiently unique so thatthe antibody specific for the epitope does not substantially cross-reactwith other epitopes. Suitable tag polypeptides generally have at least 6amino acid residues and usually between about 8-50 amino acid residues(preferably between about 9-30 residues). Examples include the c-myc tagand the 8F9, 3C7, 6E10, G4, B7 and 9E10 antibodies thereto (see, e.g.,Evan et al., Mol. Cell. Biol., 5 (12):3610-3616 (1985)); and the HerpesSimplex virus glycoprotein D (gD) tag and its antibody (see, e.g.,Paborsky et al., Protein Engineering, 3 (6):547-553 (1990)).

As used herein, the term “label” refers to a detectable compound orcomposition which is conjugated directly or indirectly to the antibody.The label may itself be detectable by itself (e.g., radioisotope labelsor fluorescent labels) or, in the case of an enzymatic label, maycatalyze chemical alteration of a substrate compound or compositionwhich is detectable.

As used herein, the term “solid phase” refers to a non-aqueous matrix towhich the antibody of the present invention can adhere. Examples ofsolid phases encompassed herein include those formed partially orentirely of glass (e.g. controlled pore glass), polysaccharides (e.g.,agarose), polyacrylamides, polystyrene, polyvinyl alcohol and silicones.In certain embodiments, depending on the context, the solid phase cancomprise the well of an assay plate; in others it is a purificationcolumn (e.g., an affinity chromatography column). This term alsoincludes a discontinuous solid phase of discrete particles. See, e.g.,U.S. Pat. No. 4,275,149.

The present invention also provides pharmaceutical compositionscontaining these CD47 antibodies and methods for treating diseases in asubject with these CD47 antibodies or pharmaceutical compositions.

As used herein, the term “treatment” or “treating” refers to boththerapeutic treatment and prophylactic or preventative measures of adisease (such as cancer or a fibrotic disease). Those in need oftreatment include those already with the disease as well as those inwhich the disease is to be prevented.

Examples of cancer include, but are not limited to, ovarian cancer,colon cancer, breast cancer, lung cancer, head and neck cancer, bladdercancer, colorectal cancer, pancreatic cancer, non-Hodgkin's lymphoma,acute lymphocytic leukemia, chronic lymphocytic leukemia, acute myeloidleukemia, chronic myelogenous leukemia, multiple myeloma, melanoma,leiomyoma, leiomyosarcoma, glioma, glioblastoma, myelomas, monocyticleukemias, B-cell derived leukemias, T-cell derived leukemias, B-cellderived lymphomas, T-cell derived lymphomas, and solid tumors. Thefibrotic disease can be, e.g., myocardial infarction, angina,osteoarthritis, pulmonary fibrosis, asthma, cystic fibrosis, bronchitis,or asthma.

As used herein, the term “subject” for purposes of treatment refers toany animal classified as a mammal, including humans, domestic and farmanimals, and zoo, sports, or pet animals, such as dogs, horses, cats,cows, etc. Preferably, the mammal is human.

The CD47 antibodies of this invention can also be used in vitro and invivo to monitor the course of CD47 disease therapy. Thus, for example,by measuring the increase or decrease in the number of cells expressingCD47, particularly cancer cells expressing CD47, it can be determinedwhether a particular therapeutic regimen aimed at ameliorating diseaseis effective.

The CD47 antibodies of this invention may be used in vitro inimmunoassays in which they can be utilized in liquid phase or bound to asolid phase carrier. In addition, the CD47 antibodies in theseimmunoassays can be detectably labeled in various ways. Examples oftypes of immunoassays which can utilize monoclonal antibodies of theinvention are flow cytometry, e.g. FACS, MACS, immunohistochemistry,competitive and non-competitive immunoassays in either a direct orindirect format. Detection of the antigens using the CD47 antibodies ofthis invention can be done utilizing immunoassays which are run ineither the forward, reverse, or simultaneous modes, includingimmunohistochemical assays on physiological samples. Those of skill inthe art will know, or can readily discern, other immunoassay formatswithout undue experimentation.

The CD47 antibodies of the invention can be bound to many differentcarriers and used to detect the presence of CD47 expressing cells.Examples of well-known carriers include glass, polystyrene,polypropylene, polyethylene, dextran, nylon, amylases, natural andmodified celluloses, polyacrylamides, agaroses and magnetite. The natureof the carrier can be either soluble or insoluble for purposes of theinvention. Those skilled in the art will know of other suitable carriersfor binding monoclonal antibodies, or will be able to ascertain such,using routine experimentation.

There are many different labels and methods of labeling known to thoseof ordinary skill in the art, which find use as tracers in therapeuticmethods, for use in diagnostic methods, and the like. For diagnosticpurposes a label may be covalently or non-covalently attached to anantibody of the invention or a fragment thereof, including fragmentsconsisting or comprising of CDR sequences. Examples of the types oflabels which can be used in the present invention include enzymes,radioisotopes, fluorescent compounds, colloidal metals, chemiluminescentcompounds, and bioluminescent compounds. Those of ordinary skill in theart will know of other suitable labels for binding to the monoclonalantibodies of the invention, or will be able to ascertain such, usingroutine experimentation. Furthermore, the binding of these labels to themonoclonal antibodies of the invention can be done using standardtechniques common to those of ordinary skill in the art.

In some embodiments, a CD47 antibody of this invention is attached to ananoparticle, e.g. for use in imaging. Useful nanoparticles are thoseknown in the art, for example including without limitation,Raman-silica-gold-nanoparticle (R—Si—Au—NP). The R—Si—Au—NPs consist ofa Raman organic molecule, with a narrow-band spectral signature,adsorbed onto a gold core. Because the Raman organic molecule can bechanged, each nanoparticles can carry its own signature, therebyallowing multiple nanoparticles to be independently detectedsimultaneously by multiplexing. The entire nanoparticle is encapsulatedin a silica shell to hold the Raman organic molecule on the goldnanocore. Optional polyethylene glycol (PEG)-ylation of R—Si—Au—NPsincreases their bioavailability and provides functional “handles”' forattaching targeting moieties. See, e.g., Thakor et al (2011), Sci.Transl. Med., 3 (79):79ra33; Jokerst et al. (2011) Small., 7 (5):625-33;Gao et al. (2011) Biomaterials, 32 (8):2141-8.

For purposes of the invention, CD47 may be detected by the CD47antibodies of this invention when present in biological fluids and ontissues, in vivo or in vitro. Any sample containing a detectable amountof CD47 can be used. A sample can be a liquid such as urine, saliva,cerebrospinal fluid, blood, serum and the like, or a solid or semi-solidsuch as tissues, feces, and the like, or, alternatively, a solid tissuesuch as those commonly used in histological diagnosis.

Another labeling technique which may result in greater sensitivityconsists of coupling the antibodies to low molecular weight haptens.These haptens can then be specifically detected by means of a secondreaction. For example, it is common to use haptens such as biotin, whichreacts with avidin, or dinitrophenol, pyridoxal, or fluorescein, whichcan react with specific anti-hapten antibodies.

As a matter of convenience, a CD47 antibody of this invention can beprovided in a kit, i.e., a packaged combination of reagents inpredetermined amounts with instructions for performing the diagnosticassay. Where the antibody is labeled with an enzyme, the kit willinclude substrates and cofactors required by the enzyme (e.g., asubstrate precursor which provides the detectable chromophore orfluorophore). In addition, other additives may be included such asstabilizers, buffers (e.g., a block buffer or lysis buffer) and thelike. The relative amounts of the various reagents may be varied widelyto provide for concentrations in solution of the reagents whichsubstantially optimize the sensitivity of the assay. Particularly, thereagents may be provided as dry powders, usually lyophilized, includingexcipients which on dissolution will provide a reagent solution havingthe appropriate concentration.

Therapeutic formulations comprising one or more antibodies of theinvention are prepared for storage by mixing the antibody having thedesired degree of purity with optional physiologically acceptablecarriers, excipients or stabilizers (see, e.g., Remington'sPharmaceutical Sciences, 16th edition, Osol, A. Ed. (1980)), in the formof lyophilized formulations or aqueous solutions. The antibodycomposition will be formulated, dosed, and administered in a fashionconsistent with good medical practice. Factors for consideration in thiscontext include the particular disorder being treated, the particularmammal being treated, the clinical condition of the individual patient,the cause of the disorder, the site of delivery of the agent, the methodof administration, the scheduling of administration, and other factorsknown to medical practitioners. The “therapeutically effective amount”of the antibody to be administered will be governed by suchconsiderations, and is the minimum amount necessary to prevent the CD47associated disease.

The therapeutic dose may be at least about 0.01 μg/kg body weight, atleast about 0.05 μg/kg body weight; at least about 0.1 μg/kg bodyweight, at least about 0.5 μg/kg body weight, at least about 1 μg/kgbody weight, at least about 2.5 μg/kg body weight, at least about 5μg/kg body weight, and not more than about 100 μg/kg body weight. Itwill be understood by one of skill in the art that such guidelines willbe adjusted for the molecular weight of the active agent, e.g. in theuse of antibody fragments, or in the use of antibody conjugates. Thedosage may also be varied for localized administration, e.g. intranasal,inhalation, etc., or for systemic administration, e.g., intraperitoneal(I.P.), intravenous (I.V.), intradermal (I.D.), intramuscular (I.M.),and the like.

A CD47 antibody of this invention needs not be, but is optionallyformulated with one or more agents that potentiate activity, or thatotherwise increase the therapeutic effect. These are generally used inthe same dosages and with administration routes as used hereinbefore orabout from 1 to 99% of the heretofore employed dosages.

Acceptable carriers, excipients, or stabilizers are non-toxic torecipients at the dosages and concentrations employed, and includebuffers such as phosphate, citrate, and other organic acids;antioxidants including ascorbic acid and methionine; preservatives (suchas octadecyldimethylbenzyl ammonium chloride; hexamethonium chloride;benzalkonium chloride, benzethonium chloride; phenol, butyl or benzylalcohol; alkyl parabens such as methyl or propyl paraben; catechol;resorcinol; cyclohexanol; 3-pentanol; and m-cresol); low molecularweight (less than about 10 residues) polypeptides; proteins, such asserum albumin, gelatin, or immunoglobulins; hydrophilic polymers such aspolyvinylpyrrolidone; amino acids such as glycine, glutarnine,asparagine, histidine, arginine, or lysine; monosaccharides,disaccharides, and other carbohydrates including glucose, mannose, ordextrins; chelating agents such as EDTA; sugars such as sucrose,mannitol, trehalose or sorbitol; salt-forming counter-ions such assodium; metal complexes (e.g., Zn-protein complexes); and/or non-ionicsurfactants such as TWEEN™, PLURONICS™ or polyethylene glycol (PEG).Formulations to be used for in vivo administration must be sterile. Thisis readily accomplished by filtration through sterile filtrationmembranes.

The active ingredients containing CD47 antibodies may also be entrappedin microcapsule prepared, e.g., by coacervation techniques or byinterfacial polymerization, for example, hydroxymethylcellulose orgelatin-microcapsule and poly-(methylmethacylate) microcapsule,respectively, in colloidal drug delivery systems (for example,liposomes, albumin microspheres, microemulsions, nano-particles andnanocapsules) or in macroemulsions. Such techniques are disclosed inRemington's Pharmaceutical Sciences 16th edition, Osol, A. Ed. (1980).

A CD47 antibody or pharmaceutical composition of this invention can beadministered by any suitable means, including parenteral, subcutaneous,intraperitoneal, intrapulmonary, and intranasal. Parenteral infusionsinclude intramuscular, intravenous, intraarterial, intraperitoneal, orsubcutaneous administration. In addition, the anti-CD47 antibody issuitably administered by pulse infusion, particularly with decliningdoses of the antibody.

For the prevention or treatment of disease, the appropriate dosage ofantibody will depend on the type of disease to be treated, as definedabove, the severity and course of the disease, whether the antibody isadministered for preventive purposes, previous therapy, the patient'sclinical history and response to the antibody, and the discretion of theattending physician. The antibody is suitably administered to thepatient at one time or over a series of treatments.

In another embodiment of the invention, an article of manufacturecontaining materials useful for the treatment of the disorders describedabove is provided. The article of manufacture comprises a container anda label. Suitable containers include, for example, bottles, vials,syringes, and test tubes. The containers may be formed from a variety ofmaterials such as glass or plastic. The container holds a compositionwhich is effective for treating the condition and may have a sterileaccess port (e.g., the container may be an intravenous solution bag or avial having a stopper pierceable by a hypodermic injection needle). Theactive agent in the composition is the anti-CD47 antibody. The label on,or associated with, the container indicates that the composition is usedfor treating the condition of choice. The article of manufacture mayfurther comprise a second container comprising apharmaceutically-acceptable buffer, such as phosphate-buffered saline,Ringer's solution and dextrose solution. It may further include othermaterials desirable from a commercial and user standpoint, includingother buffers, diluents, filters, needles, syringes, and package insertswith instructions for use.

The following examples are put forth so as to provide those of ordinaryskill in the art with a complete disclosure and description of how tomake and use the present invention, and are not intended to limit thescope of what the inventors regard as their invention nor are theyintended to represent that the experiments below are all or the onlyexperiments performed. Efforts have been made to ensure accuracy withrespect to numbers used (e.g. amounts, temperature, etc.) but someexperimental errors and deviations should be accounted for. Unlessindicated otherwise, parts are parts by weight, molecular weight isweight average molecular weight, temperature is in degrees Centigrade,and pressure is at or near atmospheric.

All publications and patent applications cited in this specification areherein incorporated by reference as if each individual publication orpatent application were specifically and individually indicated to beincorporated by reference.

The present invention has been described in terms of particularembodiments found or proposed by the present inventor to comprisepreferred modes for the practice of the invention. It will beappreciated by those of skill in the art that, in light of the presentdisclosure, numerous modifications and changes can be made in theparticular embodiments exemplified without departing from the intendedscope of the invention. For example, due to codon redundancy, changescan be made in the underlying DNA sequence without affecting the proteinsequence. Moreover, due to biological functional equivalencyconsiderations, changes can be made in protein structure withoutaffecting the biological action in kind or amount. All suchmodifications are intended to be included within the scope of theappended claims.

Establishment of Phage Library

CD47 is a 50 kDa membrane receptor that has extracellular N-terminal IgVdomain, five transmembrane domains, and a short C-terminal intracellulartail. Human CD47-IgV domain protein conjugated with human Fc orBiotinylated human CD47-IgV domain protein (ACROBiosystems) was used asantigen for phage library panning.

The phage library was constructed using phagemid vectors which consistedof the antibody gene fragments that were amplified from spleens or bonemarrows of >50 healthy human subjects. The antibody format is singlechain variable fragment (VH+linker+VL). The library size was 1.1×1010and the sequence diversity was analyzed as follows. For the 62 clonespicked up from the library and further sequenced, 16 sequences havetruncation, frameshift or amber codon; 46 sequences have full lengthscFv of which all the HCDR3 sequences are unique. In the 46 full lengthscFv, 13 sequences have lambda light chain and 33 sequences have kappalight chain.

Phage Panning and Clone Selection

To obtain phage clones that specifically bind to the human CD47-IgVdomain, two methods for phage panning were used.

1. Phage Library Immunotube Panning Against Human CD47-IgV

In this method, the phage libraries developed as described above werefirst incubated in casein-coated immunotube for 2 hours. The humanCD47-IgV-Fc fusion protein was used for first round of panning. Unboundphages were removed by washing with PBST for 5-20 times. The boundphages were eluted with freshly prepared 100 mM Triethylamine solutionand neutralized by addition a Tris-HCl buffer, to become the firstoutput phage pools. This first output phage pool was rescued throughinfection of E. Coli TG-1 cells for amplification, followed by thesecond round of panning using biotinylated human CD47-IgV as antigen.The bound phages were eluted in the same process and became the secondoutput phage pool which was then rescued and then again followed by thethird round of panning using human CD47-IgV-Fc fusion protein asantigen. The bound phages then became the third output phage pool andunderwent the fourth round of panning using biotinylated human CD47-IgV.

2. Phage Library Solution Panning Against Human CD47-IgV

In this second method, the phage libraries were first incubated incasein-blocked 100 μl streptavdin-magnetic beads to deplete streptavdinbeads binders. The streptavidin-magnetic beads and AG0084-huIgG1/k wereused for negative depletion. The depleted library was rescued, which wasfollowed by the second round of panning using biotinylated humanCD47-IgV as antigens and further underwent negative depletion withcasein blocked streptavdin-magnetic beads. The unbound phages wereremoved by washing with PBST for 5-20 times. The bound phages wereeluted with a freshly prepared 100 mM Triethylamine solution,neutralized by addition of a Tris-HCl buffer, and then rescued, whichwas followed by the third round of panning using human CD47-IgV-Fcfusion protein and depleted with AG0084-huIgG1/k. The bound phages thenbecome the third output phage pool and underwent the fourth round ofpanning using biotinylated human CD47-IgV and negative depletion withcasein blocked streptavdin-magnetic beads.

After this process, multiple phage clones that specifically bound to thehuman CD47-IgV domain were obtained and enriched. They were then dilutedand plated to grow at 37° C. for 8 hours and captured by anti-kappaantibody-coated filter overnight. Biotinylated human CD47-IgV (50 nM)and NeutrAvidin-AP conjugate (1:1000 dilution) were applied to thefilter to detect the positively bound phage clones. Positive phageplaques were picked and eluted into 100 μL of phage elution buffer.About 10-15 μL eluted phages were used to infect 1 mL XL1 blue cells tomake high titer phage (HT) for Phage single point ELISA (SPE). Thepositive single clones picked from the filer lift were subjected to thebinding of human CD47-IgV-Fc fusion protein and biotinylated humanCD47-IgV domain protein. These positive single clones were alsosequenced for their VH and VL genes. All the positive hits with uniqueVH and VL genes were cloned into expression vectors pFUSE2ss-CLIg-hk(light chain, InvivoGen, Cat No. pfuse2ss-hclk) and pFUSEss-CHIg-hG1(heavy chain, InvivoGen, Cat No. pfusess-hchg1). The antibodies wereexpressed in HEK293 cells and purified by Protein A Plus Agarose.

Affinity Maturation of CD-47 Antibodies

Binding affinity of the CD-47 antibodies of this invention can beimproved by in vitro affinity maturation, e.g., by site-specificrandomized mutation, which resulted in mutated sequences that are alsowithin the scope of this invention.

For example, BiaCore analysis of 1F8, a CD47 antibody of this invention,showed a binding affinity (KD) of 2.8 nM with a high dissociation rateof 1.04E-03 1/s, which could be improved by in vitro affinitymaturation. An extensive analysis of the CDR sequence of heavy chain andlight chain of 1F8 identified several residues in HCDR1 and LCDR1regions that could be randomized mutated. Therefore, the randommutagenesis libraries can be constructed and introduced into thespecific residues to generate a variety of new sequences. The CDRmutagenesis libraries are panned using biotinylated soluble CD47 ECD insolution phase under the equilibrium condition. After multiple rounds ofpanning with reduced antigen concentration, enriched output binders areselected for the binding ELISA test and subsequent converted into fullIgGs which are subjected to the BiaCore analysis to specifically selectfor the off-rate improved sequence. Through this screening process,antibody molecules of this invention can be constructed for overall bestproperties for clinical applications.

Example 1. ELISA Screening of Phage Clones Binding to RecombinantCD47-ECD Protein

Recombinant human CD47-Fc fusion protein (Acrobiosystems) was coated at2 ug/mL in phosphate buffer saline (PBS) onto microtiter plates for 2hours at the room temperature (RT). After coating of antigen, the wellswere blocked with PBS/0.05% Tween (PBST) with 1% BSA for 1 hour at theroom temperature (RT). After washing of the wells with PBST, purifiedphages from single clones were added to the wells and incubated for 1hour at RT. For detection of the binding phage clones, the HRPconjugated secondary antibodies against M13 (Jackson Immuno Research)were added, followed by the addition of fluorogenic substrates (Roche).Between all incubation steps, the wells of the plate were washed withPBST three times. Fluorescence was measured in a TECAN Spectrafluorplate reader. The positive phage clones were selected for sequencing ofthe heavy chain and light chain genes.

All of the tested CD47 antibodies of this invention showed good bindingactivities for recombinant human CD47-Fc fusion protein.

Example 2. ELISA Analysis of Antibodies Blocking the Interaction of CD47to SIRPα

Recombinant human CD47/mouse Fc fusion protein or biotinylated CD47protein (Acrobiosystems) was coated at 1 ug/mL in PBS onto microtiterplates for 2 hours at RT. After coating of antigen the wells wereblocked with PBS/0.05% Tween (PBST) with 1% BSA for 1 hour at RT. Afterwashing of the wells with PBST, the antibodies diluted in PBS were addedto the wells (5 ug/mL) and incubated for 1 hour at RT. For detection ofthe binding antibodies, the HRP conjugated secondary antibodies againsthuman Fc (Jackson Immuno Research) were added, followed by the additionof fluorogenic substrates (Roche). Between all incubation steps, thewells of the plate were washed with PBST three times. Fluorescence wasmeasured in a TECAN Spectrafluor plate reader.

All of the tested CD47 antibodies of this invention showed good bindingactivities for recombinant human CD47-Fc fusion protein and biotinylatedCD47 protein.

Example 3. ELISA Analysis of Antibodies Blocking the Interaction of CD47to SIRPα

Recombinant CD47-Fc fusion protein (Acrobiosystems) was coated at 1ug/mL in PBS onto microtiter plates for 16 hours at 4° C. After blockingfor 1 hour with 1% BSA in PBST at RT, 1 ug/ml of SIRPa-His protein wasadded either in the absence or presence of CD47 antibodies (10 ug/mL) atRT for 1 hour. Plates were subsequently washed three times and incubatedwith an HRP-conjugated anti-His secondary antibody for 1 hour at RT.After washing, the TMB solution was added to each well for 30 minutesand the reaction was stopped with 2.0 M H₂SO₄, and OD was measured at490 nm.

All of the tested CD47 antibodies of this invention effectively blockedthe CD47 protein-SIRPα binding.

Example 4. Dose-Dependent Response of CD47 Antibodies Binding toMonomeric CD47-ECD

After direct binding and competition screening, a CD47 antibody of thisinvention 1F8 was selected for this test, in comparison with twoexisting reference antibodies. Biotinylated CD47 protein(Acrobiosystems) was coated at 1 ug/mL in PBS onto microtiter plates for2 hours at RT. After coating of antigen, the wells were blocked withPBS/0.05% Tween (PBST) with 1% BSA for 1 hour at RT. After washing ofthe wells with PBST, different concentrations of CD47 antibodies wereadded to the well and incubated for 1 hour at RT. For detection of thebinding antibodies, the HRP conjugated secondary antibodies againsthuman Fc (Jackson Immuno Research) were added followed by the additionof fluorogenic substrates (Roche). Between all incubation steps, thewells of the plate were washed with PBST three times. Fluorescence wasmeasured in a TECAN Spectrafluor plate reader.

Reference antibodies 5F9 and 2A1 was produced according to the sequenceof Hu5F9 and CC-90002 as disclosed by researchers at StanfordUniversity, Inhibrx LLC, and Celgene Corp. (see, e.g., U.S. Pat. Nos.9,017,675 B2, 9,382,320, 9,221,908, US Pat. Application Pub. No.2014/0140989 and WO 2016/109415) and used for the same study.

As shown in FIG. 1, all three antibodies (1F8, 5F9, and 2A1) showedsimilar binding activities to monomeric CD47-ECD.

Example 5. Dose-Dependent Response of CD47 Antibodies Binding to DimericCD47-ECD

The three CD47 antibodies used in Example 4 (i.e., 1F8, 5F9, and 2A1)were also used in this study.

CD47/mouse Fc fusion protein (Acrobiosystems) was coated at 1 ug/ml inPBS onto microtiter plates for 2 hours at RT. After coating of antigenthe wells were blocked with PBS/0.05% Tween (PBST) with 1% BSA for 1hour at RT. After washing of the wells with PBST, differentconcentrations of anti-CD47 antibodies were added to the well andincubated for 1 at RT. For detection of the binding antibodies, the HRPconjugated secondary antibodies against human Fc (Jackson ImmunoResearch) were added followed by the addition of fluorogenic substrates(Roche). Between all incubation steps, the wells of the plate werewashed with PBST three times. Fluorescence was measured in a TECANSpectrafluor plate reader.

Likewise, as shown in FIG. 2a , among the three tested antibodies 1F8,5F9, and 2A1, all of them showed similar binding activities to dimericCD47-ECD.

Another binding study was conducted to compare the binding affinity oftwo antibodies of this invention, i.e., 1F8 and 13H3, to recombinantCD49-ECD. As shown in FIG. 2b , these two antibodies also exhibitedsimilar binding activities in a dose-dependent manner, with EC₅₀ being0.038 nM for 1F8 and 0.045 nM for 13H3.

Example 6. Dose-Dependent Response of CD47 Antibodies Blocking theBinding of CD47 to SIRPα

Three CD47 antibodies (i.e., 1F8, 5F9, and 2A1) were also used in thisstudy.

Recombinant CD47-Fc fusion protein (Acrobiosystems) was coated at 1ug/ml in PBS onto microtiter plates for 16 hours at 4° C. After blockingfor 1 h with 1% BSA in PBST at RT, 1 ug/mL of SIRPa-His protein wasadded either in the absence or presence of different concentrations ofanti-CD47 antibodies at RT for 1 h. Plates were subsequently washedthree times and incubated with an HRP-conjugated anti-His secondaryantibody for 1 h at RT. After washing, the TMB solution was added toeach well for 30 min and the reaction was stopped with 2M H₂SO₄, and ODwas measured at 490 nm.

Again, as shown in FIG. 3a , all three antibodies showed similaractivities in blocking the binding of CD47 to SIRPα.

Another study was conducted to compare the ability of two CD47antibodies of this invention 1F8 and 13H3 to block the binding of CD47to SIRPα. As shown in FIG. 3b and FIG. 3c , these two antibodies alsoexhibited similar blocking activities in a dose-dependent manner, withIC₅₀ being 0.78 nM for 1F8 and 0.20 nM for 13H3.

Example 7. Dose-Dependent Response of CD47 Antibodies Binding to CD47⁺Raji Cells

Three CD47 antibodies (i.e., 1F8, 5F9, and 2A1) were also used in thisstudy.

Raji cells which endogenously express human CD47 on the surface werestained with different concentrations of 1F8, 5F9 and 2A1 antibodies at4° C. for 30 minutes. Then, the cells were washed with PBS three times,followed by incubation with APC-labeled anti-human Fc specific antibody(Invitrogen) at 4° C. for 30 minutes. Binding was measured using aFACSCanto (Becton-Dickinson).

As shown in FIG. 4a , all three antibodies showed similar activities inbinding to CD47⁺ Raji cells, following the same dose-dependent pattern.

Another study was conducted to compare the ability of two CD47antibodies of this invention 1F8 and 13H3 to bind to CD47-bearing Rajicells. As shown in FIG. 4b , 13H3 exhibited stronger affinity than 1F8in binding CD47-bearing Raji cells, with EC₅₀ being 2.95 nM for 1F8 and1.06 nM for 13H3.

FIG. 4c and FIG. 4d show the binding kinetics of 1F8 and 13H3,respectively, as measured by Biocore analysis; and FIG. 4e shows thedata.

Example 8. Study of Phagocytosis of Tumor Cells by Human Macrophage (Mϕ)

Three CD47 antibodies (i.e., 1F8, 5F9, and 2A1) were also used in thisstudy.

PBMCs were isolated from human blood, and the monocytes weredifferentiated into macrophages for 6 days. The monocyte derivedmacrophages (MDMs) were scraped and re-plated in 24-well dishes andallowed to adhere for 24 hours. The human tumor cell line Raji whichendogenously expressed CD47 were chosen as target cells and labeled with1 uM CFSE for 10 minutes, then added to MDMs at a ratio of 5:1 tumorcells per phagocyte and CD47 antibodies was added at various doses.After incubation for 3 hours, non-phagocytosed target cells were washedaway with PBS and the remaining phagocytes were scraped off, stainedwith macrophage marker CD14 antibody, and analyzed by flow cytometry.Phagocytosis was measured by gating on CD14⁺ cells and then assessingthe percent of CFSE⁺ cells.

As shown in FIG. 5a , all these three tested antibodies (i.e., 1F8, 5F9,and 2A1) showed similar activities in promoting phagocytosis of tumorcells by human Mϕ. FIGS. 6a, 6b, and 6c show the macrophage-mediatedphagocytosis of three different human blood cancer cell lines, triggeredby the three CD47 antibodies.

Another study was conducted to compare the ability of two CD47antibodies of this invention 1F8 and 13H3 to promote phagocytosis oftumor cells by human Mϕ. As shown in FIG. 5b , 13H3 and 1F8 exhibitedsimilar abilities with 13H3 slightly stronger phagocytosis at someconcentrations.

Example 9. RBC-Sparing Property in RBC Agglutination Assay

Human RBCs were diluted to 10% in PBS and incubated at 37° C. for 2hours with a titration of CD47 antibodies in a round bottom 96-wellplate. Evidence of hemagglutination is demonstrated by the presence ofnon-settled RBCs, appearing as a haze compared to a punctuate red dot ofnon-hemagglutinated RBCs (see FIGS. 7a and 8a ). The graphs in FIGS. 7band 8b show the quantitation of the hemagglutination assay, denoted“agglutination index” determined by quantitating the area of the RBCpellet in the presence of the antibody, normalized to that of IgGcontrol.

As shown in FIGS. 7a, 7b, 8a, and 8b , while CD47 antibody 5F9 alreadyshowed significant RBC agglutination at a concentration of or higherthan 0.1 ug/uL, CD47 antibodies 1F8 and 2A1 resulted in essentially noRBC agglutination at the tested concentrations up to 30 ug/uL (FIGS. 7aand 7b ) or even up to 150 ug/mL (FIGS. 8a and 8b ).

Likewise, FIGS. 8c and 8d show that CD47 antibodies of this invention(i.e., 1F8 and 13H3) resulted in essentially no RBC agglutination at thetested concentrations up to 150 ug/mL, whereas CD47 antibody 5F9 alreadyshowed significant RBC agglutination at a concentration of or higherthan 0.1 ug/uL.

Example 10. RBC Binding Assay

Binding of CD47 antibodies against human RBCs was examined by flowcytometry. Human RBCs were incubated with CD47 antibodies (10 ug/mL) at4° C. for 1 hour, followed by the addition of APC-conjugated secondaryantibody at 4° C. for 30 minutes.

As shown in FIGS. 9a and 9b , surprisingly, CD47 antibody of thisinvention 1F8 did not bind to RBC while reference CD47 antibodies 5F9and 2A1 did at the tested concentrations.

Likewise, FIGS. 9c and 9d show that while 1F8 resulted in no RBC bindingat the tested concentrations, 13H3 only resulted in very low RBC bindingat the tested concentrations.

Example 11. RBC Agglutination Assay

RBCs were collected from six male and six female healthy individuals forthe analysis of RBC agglutination by the addition of CD47 antibodies.FIGS. 10a and 10b show the titration results of the hemagglutinationassay, which is denoted “agglutination index” as determined by measuringthe area of the RBC pellets in the presence of the antibody, normalizedto that of IgG control or reference antibody.

Example 12. Platelet Binding Assay

Binding of CD47 antibodies of this invention against human platelets wasexamined by flow cytometry. Human peripheral whole blood was incubatedwith test CD47 antibodies of this invention (at 10 ug/mL) or SIRPα-Igfusion and CD61 was stained as a surface marker for platelets. Thebinding of CD47 antibodies or SIRPα-Ig fusion was measured by gating onthe CD61 positive population (platelet) and further examining thepercentages of CD47 or SIRPα-Ig fusion binding.

As shown in FIG. 11, tested CD47 antibodies of this invention did notappreciably bind to human platelets whereas SIRPα proteins did.

Example 13. Cyno RBC Agglutination Assay

RBCs from male and female cyno monkey were diluted to 10% in PBS andincubated at 37° C. for 2 hours with the indicated concentrations ofCD47 antibodies in a round bottom 96-well plate. Evidence ofhemagglutination was demonstrated by the presence of non-settled RBCs,appearing as a haze compared to a punctuate red dot ofnon-hemagglutinated RBCs, as shown in FIG. 12a . FIG. 12b shows thetitration results of the hemagglutination assay, which is denoted“agglutination index” as determined by measuring the area of the RBCpellets in the presence of the antibody, normalized to that of IgGcontrol.

The data show that the tested CD47 antibodies of this invention did notappreciably induce cyno RBC agglutination in vitro.

Example 14. Phagocytosis of Primary Human AML Cells by CD47 Antibodies

Primary PBMCs from AML patient (AML-PB003F) were labeled with 1 uM CFSEfor 10 minutes, then added to MDMs at a ratio of 5:1 tumor cells perphagocyte and the indicated CD47 antibodies was added at variousconcentrations. After 3-hr incubation, non-phagocytosed target cellswere washed away with PBS and the remaining phagocytes were scraped off,stained with a CD14 antibody, and analyzed by flow cytometry.Phagocytosis was measured by gating on CD14+ cells and then assessingthe percentage of CFSE+ cells. Phagocytosis was measured as previouslymentioned.

As shown in FIGS. 13a -13 h, the tested CD47 antibodies of thisinvention all showed significant AML binding capabilities (greater than75%) and phagocytosis capabilities (at least 36%), all of which are muchhigher than the reference CD47 antibody used in the same essay.

Example 15. In Vivo Efficacy of 1F8 Using Luciferase-Raji XenograftModel (CDX)

NSG mice were engrafted with Raji Luc-EGFP at a concentration of 1million cells/mouse via tail vein injection. They were imaged in vivo todetermine the level of engraftment five days post engraftment. Treatmentof CD47 antibodies (i.e., 1F8, 5F9, and 2A1) started from the same dayat a dose of 10 mg/kg. All mice were injected every other day viaintraperitoneal injection. Mice were imaged in vivo via IVIS Lumina IIIimaging system at the following time points: Day 0 of antibodytreatment, Day 2 of treatment, Day 6 of treatment, and Day 9 oftreatment. The tumor growth in the mice was measured by the analysis ofbioluminescent radiance through in vivo live imaging system.

As can be seen in FIG. 14a , the analysis of bioluminescent radianceshows that the tumors in the mice barely grew within the first threedays after the treatments with the tested CD47 antibody of thisinvention (i.e., 1F8) and the tumors reduced from day 6 after thetreatments. By comparison, the tumors in the mice treated with referenceCD47 antibody continued to grow during the same treatment period.

Similarly, FIG. 14b shows that the CD47 antibody 13H3 was also effectivein vivo in Raji xenograph model at different test concentrations.

In the end of Raji-xenograft study, all the mice were euthanized by theuse of CO₂ for rodent euthanasia. The splenocytes from four groups ofmice were isolated and analyzed for the percentage of M1 macrophages (%of CD80 positive in F4/80 positive macrophages) and M2 macrohpages (% ofCD206 positive in F4/80 positive macrophages) by flow cytometryanalysis.

As shown in FIGS. 15a -15 b, all of the tested CD47 antibodies(including 1F8) were able to induce polarization of macrophage intumor-bearing mice.

Example 16. CD47 Expression Profile Using PDX Samples of Various HumanCancer Types

54 PDX samples (across 7 human cancer types) were analyzed for theexpression of CD47 by immuno-histochemistry staining. The levels of CD47staining in various PDX samples were scored by geometry and stainingintensity. FIGS. 16a, 16b and 16c show the different expression levelsof CD47 after the treatments with CD47 antibodies.

Example 17. Safety Pharma Study (In Vivo Cyno PK Studies)

Naïve cyno monkeys were intravenously infused with vehicle (n=2), 1F8(n=3, 15 mg/kg) and 5F9 (n=3, 15 mg/kg). Hematology (CBC) was analyzedwithin 24 hours after blood collection, twice before the injections andat 3, 6, 10, 14 and 21 days following the antibody administration. CBCparameters were examined including Erythrocyte count (RBC), Hemoglobin(HGB), Absolute Reticulocytes and Platelet Counts. The results aredepicted in FIGS. 17a-17d and showed that 1F8 treatments did not affectthe hematology parameters in cyno monkey.

Similarly, Naïve cyno monkeys (n=2) were intravenously injected withCD47 antibody 13H3 at a dose of 20 mg/kg. Their blood was collected byvenipuncture into tubes with no anticoagulant at different time points.Serum level of the CD47 antibody 13H3 was measured by ELISA using CD47protein as the coating reagent, followed by detection with anHRP-conjugated anti-human Kappa secondary antibody. Pharmacokineticparameters in cyno monkeys were analyzed by Winolin and shown in FIG.17e and the following table.

T_(1/2) (h) C_(max) (μg/ml) AUC_(0-t) (day*ug/ml) AUC_(inf) (day*ug/ml)CL (ml/hr/kg) 145.2 ± 10.8 536.4 ± 63.9 10692.1 ± 1300.9 10712.5 ±1298.4 1.880 ± 0.228

Safety Pharm Study (Hematology) of Antibody 13H3 in Cynomolgus Monkey

Naïve cyno monkeys were intravenously infused with single dose or repeatdose (weekly dosing) of the anitibody 13H3 (20 mg/kg). Hematology (CBC)parameters were examined including Erythrocyte count (RBC), Hemoglobin(HGB), Platelet Counts and Lymphocyte Counts at the indicated timepoints following the antibody administration.

FIGS. 19a, 19b, 19c, 19d, 19e, 19f, 19g, and 19h show the effects of theCD47 antibody 13H3 on RBC congregation, hemoglobin, platelets, andlymphocytes.

Example 18. Structure of Antibody 1F8

The epitope binning of CD47 antibodies was assessed by competitionELISA. CD47 ECD protein and first anti-CD47 antibody were pre-incubatedand added to a biotinylated second anti-CD47 antibody detected by aStrptavidin-HRP antibody. If the first anti-CD47 antibody competedagainst the binding of CD47 ECD to the second antibody, both antibodieswere placed in same or overlapping epitope bins. If not, they wereplaced in non-overlapping epitope bins. The results depicted in FIGS.18a and 18b show that CD47 antibody of this invention 1F8 has adifferent epitope than those of reference antibodies 5F9 and 2A1.

FIG. 18c shows the crystal structure of reference Ab 5F9 (upper part) incomplex with human CD47-ECD (green) as reported in the literature (See,e.g., J. Clin. Investigation, 126, 7: 2610-2620).

FIG. 18d shows the crystal structure of 1F8-Fab (upper part) in complexwith human CD47-ECD (green). The complex structure of CD47-1F8 Fabadopts straighter head to head orientation, unlike the complexstructures of CD47-SIRPα and CD47-5F9 diabody presenting tilted head tohead orientation. The 1F8 epitope on CD47 is discontinuous and extensivewhich includes residues L3, V25, T26, N27, M28, E29, A30, Q31, T34, E35,Y37, A53, L54, L74, K75, G76, T99, E100, L101, T102 and R103, of whichL3, N27, E29, Q31, T34, E35, Y37, A53, T99, E100, L101, T102 and R103are involved in the interactions with SIRPα, explaining the antagonisticproperties of 1F8. The complex structure also reveals VH domain of 1F8forms 8 hydrogen bonds and 4 salt bridges to CD47 and VL domain of 1F8forms 8 hydrogen bonds to CD47 as well.

Unlike published CD47-IgV/antibody or SIRPa complex structures, the 1F8antibody binds mostly different epitopes of the target although all arebinding in the similar head-to-head orientation. The 1F8 epitope on CD47is conformationally discontinuous and includes a TNMEAQ loop (residues26-31), T34, E35, L74, and an LTR hinge (residues 101 -103) of CD47.Many hydrogen bond interactions are formed between side chains ofantibody residues and CD47 main chain oxygen atoms. A salt bridge isalso formed between R103 of 1F8 and E35 of CD47. Several Van der Waalscontacts are also observed which are critical to keep appropriateorientation. The VH domain of antibody 1F8 is primarily involved inbinding to the T34, E35 and the LTR hinge (residues 101-103) of CD47,while the VK domain interact with the TNMEAQ loop (residues 26-31) andL74. These epitopes on CD47 are different from that in 5F9 antibody andSIRPa. Structural analysis suggest that two long loops (residues 26-38and 52-59) of the 1F8 antibody help it bind to CD47 in a nearly verticalorientation which may lead to the antibody to be separated in such a waythat CD47 on adjacent cells could not be bridged by the antibody,thereby preventing most of blood cell hemaglutination.

FIG. 18e shows the comparison of interaction of 5F9 and 1F8 with CD47.

Superposition of reference antibody 5F9/CD47 complex structure oncomplex structure of 1F8/CD47 reveals that binding orientation of CD47is very different between these two complexes. Although both antibodieshave head-to-head binding orientation, CD47 is rotated horizontally byabout 180 degree. The structure of 1F8/CD47 complex has CD47 N-terminalpyroglutamate near light chain loop residues 61-64, while 5F9 has CD47N-term among 3 heavy chain loops of W52, N32 and W101. In antibody 1F8,the heavy chain residues Trp33 and Arg103 form van der Waals contact anda salt bridge with Leu101 and Glu35 of CD47, respectively. At the sameposition, antibody 5F9's residue Tyr101 point towards N-term of CD47through a van der Waals contact and Arg102 forms a hydrogen bond withGlu104 of CD47. Antibody 1F8's loop residues Asn31, Trp33, and hingeresidues Arg53 and Asp56 form inter-domain hydrogen bonds net, thenAsn31 and Arg53 form hydrogen bonds with main chain of Leu101 and Thr34in CD47. At the same interface, 5F9 does not appear to make interaction,except residue Tyr 52 forms a van der Waals contact with Leu3 on CD47.The hinge (residue 52-56) is 3 residues shorted than that of 1F8(residues 52-59). In light chain, both Fab 1F8 and 5F9 have severalimportant hydrogen bond interactions with CD47 from the loop (V29 -Y38in 1F8 and V152-Y158 in 5F9). Residues Y97 and Y98 in 1F8 “push” theloop (residues 26-38) away, and the latter formed 2 hydrogen bondsbetween 1F8 and CD47, namely between Arg34 of 1F8 and main chain ofLeu74 on CD47, and between Arg36 of 1F8 and main chain of Thr26 on CD47.However, 5F9's residues Gly218 and Ser219 (which correspond to Tyr97 andTyr98 in 1F8) cause the loop (residues 149-158) in 5F9 to form 3hydrogen bonds with CD47 (at Asn157-Lys39, Tyr159-G1u104 andLys177-Thr99,). Also like that in heavy chain, the loop (residues149-158) in 5F9 is about 3 residues shorter than that in 1F8 (residues26-38). These relative longer loops in 1F8 mainly contribute to thebinding orientation of the CD47.

Example 19. CD47 Antibody 34C5

To generate anti-human CD47 antibodies, different strains of 6-8-weekmice including BALB/C, C57/BL6 or SJL mice were immunized withrecombinant human CD47 extracellular domain protein for several rounds.After immunization, mice with sufficient titres of anti-CD47 IgG wereboosted with the same antigen followed by fusion. The hybridomasupernatants were tested for direct binding with human CD47 ECD proteinand competition of SIRPα binding to CD47 by ELISA screening. Through aseries of screening assays, 34C5 was selected for the humanization andfurther in vitro characterization according to the assays describedabove.

FIG. 20 and FIG. 21 show strong binding affinity of 34C5 to recombinantCD47-ECD (with an EC₅₀ of 0.27 nM) and to CD47-bearing Raji cells (withan EC₅₀ of 0.83 nM), respectively.

FIG. 22 shows that 34C5 was able to effectively block CD47 binding toSIRPα, with an EC₅₀ of 0.30 nM.

FIG. 23 shows that the antibody 34C5 promoted phagocystosis of tumorcells by human Mϕ.

FIG. 24 shows the antibody 34C5 did not cause in vitro RBCagglutination.

FIG. 25 shows the antibody 34C5 decrease its binding to RBC with thedecreasing concentration of this antibody.

1. An isolated monoclonal antibody or immunologically active fragmentthereof that binds to human CD47, comprising: a variable heavy (VH)chain sequence that is at least 95% identical to an amino acid sequenceselected from the group consisting of SEQ ID NO: 1, SEQ ID NO: 3, SEQ IDNO: 5, SEQ ID NO: 7, SEQ ID NO: 9, SEQ ID NO: 11, SEQ ID NO: 13, SEQ IDNO: 15, SEQ ID NO: 17, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23, SEQID NO: 25, SEQ ID NO: 27, SEQ ID NO: 29, SEQ ID NO: 31, SEQ ID NO: 33,SEQ ID NO: 35, SEQ ID NO: 37, SEQ ID NO: 39, SEQ ID NO: 41, SEQ ID NO:43, SEQ ID NO: 45, SEQ ID NO: 47, SEQ ID NO: 49, SEQ ID NO: 51, SEQ IDNO: 53, SEQ ID NO: 55, SEQ ID NO: 57, SEQ ID NO: 59, SEQ ID NO: 61, SEQID NO: 63, SEQ ID NO: 65, SEQ ID NO: 67, SEQ ID NO: 69, SEQ ID NO: 71,SEQ ID NO: 73, SEQ ID NO: 75, and SEQ ID NO: 77; and a variable light(VL) chain sequence that is at least 95% identical to an amino acidsequence selected from the group consisting of SEQ ID NO: 2, SEQ ID NO:4, SEQ ID NO: 6, SEQ ID NO: 8, SEQ ID NO: 10, SEQ ID NO: 12, SEQ ID NO:14, SEQ ID NO: 16, SEQ ID NO: 18, SEQ ID NO: 20, SEQ ID NO: 22, SEQ IDNO: 24, SEQ ID NO: 26, SEQ ID NO: 28, SEQ ID NO: 30, SEQ ID NO: 32, SEQID NO: 34, SEQ ID NO: 36, SEQ ID NO: 38, SEQ ID NO: 40, SEQ ID NO: 42,SEQ ID NO: 44, SEQ ID NO: 46, SEQ ID NO: 48, SEQ ID NO: 50, SEQ ID NO:52, SEQ ID NO: 54, SEQ ID NO: 56, SEQ ID NO: 58, SEQ ID NO: 60, SEQ IDNO: 62, SEQ ID NO: 64, SEQ ID NO: 66, SEQ ID NO: 68, SEQ ID NO: 70, SEQID NO: 72, SEQ ID NO: 74, SEQ ID NO: 76, and SEQ ID NO:
 78. 2. Theisolated monoclonal antibody or immunologically active fragment thereofof claim 1, comprising a VH/VL pair, wherein the VH/VL pair comprises VHand VL chain sequences at least 95% identical to a pair of VH and VLamino acid sequences selected from the group consisting of SEQ ID NO: 1and SEQ ID NO: 2, SEQ ID NO: 3 and SEQ ID NO: 4, SEQ ID NO: 5 and SEQ IDNO: 6, SEQ ID NO: 7 and SEQ ID NO: 8, SEQ ID NO: 9 and SEQ ID NO: 10,SEQ ID NO: 11 and SEQ ID NO: 12, SEQ ID NO: 13 and SEQ ID NO: 14, SEQ IDNO: 15 and SEQ ID NO: 16, SEQ ID NO: 17 and SEQ ID NO: 18, SEQ ID NO: 19and SEQ ID NO: 20, SEQ ID NO: 21 and SEQ ID NO: 22, SEQ ID NO: 23 andSEQ ID NO: 24, SEQ ID NO: 25 and SEQ ID NO: 26, SEQ ID NO: 27 and SEQ IDNO: 28, SEQ ID NO: 29 and SEQ ID NO: 30, SEQ ID NO: 31 and SEQ ID NO:32, SEQ ID NO: 33 and SEQ ID NO: 34, SEQ ID NO: 35 and SEQ ID NO: 36,SEQ ID NO: 37 and SEQ ID NO: 38, SEQ ID NO: 39 and SEQ ID NO: 40, SEQ IDNO: 41 and SEQ ID NO: 42, SEQ ID NO: 43 and SEQ ID NO: 44, SEQ ID NO: 45and SEQ ID NO: 46, SEQ ID NO: 47 and SEQ ID NO: 48, SEQ ID NO: 49 andSEQ ID NO: 50, SEQ ID NO: 51 and SEQ ID NO: 52, SEQ ID NO: 53 and SEQ IDNO: 54, SEQ ID NO: 55 and SEQ ID NO: 56, SEQ ID NO: 57 and SEQ ID NO:58, SEQ ID NO: 59 and SEQ ID NO: 60, SEQ ID NO: 61 and SEQ ID NO: 62,SEQ ID NO: 63 and SEQ ID NO: 64, SEQ ID NO: 65 and SEQ ID NO: 66, SEQ IDNO: 67 and SEQ ID NO: 68, SEQ ID NO: 69 and SEQ ID NO: 70, SEQ ID NO: 71and SEQ ID NO: 72, SEQ ID NO: 73 and SEQ ID NO: 74, SEQ ID NO: 75 andSEQ ID NO: 76, and SEQ ID NO: 77 and SEQ ID NO:
 78. 3. The isolatedmonoclonal antibody or immunologically active fragment thereof of claim1, comprising a VH/VL pair, wherein the VH/VL pair comprises VH and VLchain sequences selected from the group consisting of SEQ ID NO: 1 andSEQ ID NO: 2, SEQ ID NO: 3 and SEQ ID NO: 4, SEQ ID NO: 5 and SEQ ID NO:6, SEQ ID NO: 7 and SEQ ID NO: 8, SEQ ID NO: 9 and SEQ ID NO: 10, SEQ IDNO: 11 and SEQ ID NO: 12, SEQ ID NO: 13 and SEQ ID NO: 14, SEQ ID NO: 15and SEQ ID NO: 16, SEQ ID NO: 17 and SEQ ID NO: 18, SEQ ID NO: 19 andSEQ ID NO: 20, SEQ ID NO: 21 and SEQ ID NO: 22, SEQ ID NO: 23 and SEQ IDNO: 24, SEQ ID NO: 25 and SEQ ID NO: 26, SEQ ID NO: 27 and SEQ ID NO:28, SEQ ID NO: 29 and SEQ ID NO: 30, SEQ ID NO: 31 and SEQ ID NO: 32,SEQ ID NO: 33 and SEQ ID NO: 34, SEQ ID NO: 35 and SEQ ID NO: 36, SEQ IDNO: 37 and SEQ ID NO: 38, SEQ ID NO: 39 and SEQ ID NO: 40, SEQ ID NO: 41and SEQ ID NO: 42, SEQ ID NO: 43 and SEQ ID NO: 44, SEQ ID NO: 45 andSEQ ID NO: 46, SEQ ID NO: 47 and SEQ ID NO: 48, SEQ ID NO: 49 and SEQ IDNO: 50, SEQ ID NO: 51 and SEQ ID NO: 52, SEQ ID NO: 53 and SEQ ID NO:54, SEQ ID NO: 55 and SEQ ID NO: 56, SEQ ID NO: 57 and SEQ ID NO: 58,SEQ ID NO: 59 and SEQ ID NO: 60, SEQ ID NO: 61 and SEQ ID NO: 62, SEQ IDNO: 63 and SEQ ID NO: 64, SEQ ID NO: 65 and SEQ ID NO: 66, SEQ ID NO: 67and SEQ ID NO: 68, SEQ ID NO: 69 and SEQ ID NO: 70, SEQ ID NO: 71 andSEQ ID NO: 72, SEQ ID NO: 73 and SEQ ID NO: 74, SEQ ID NO: 75 and SEQ IDNO: 76, and SEQ ID NO: 77 and SEQ ID NO:
 78. 4. The isolated monoclonalantibody or immunologically active fragment thereof of claim 1, whereinthe isolated monoclonal antibody or immunologically active fragmentthereof is chimeric or humanized.
 5. The isolated monoclonal antibody orimmunologically active fragment thereof of claim 1, wherein the isolatedmonoclonal antibody or immunologically active fragment thereof preventshuman CD47 from interacting with signal-regulatory-protein α (SIRPα). 6.The isolated monoclonal antibody or immunologically active fragmentthereof of claim 1, wherein the isolated monoclonal antibody orimmunologically active fragment thereof promotes macrophage-mediatedphagocytosis of a CD47-expressing cell.
 7. The isolated monoclonalantibody or immunologically active fragment thereof of claim 1, whereinthe isolated monoclonal antibody or immunologically active fragmentthereof does not cause a significant level of hemagglutination ordepletion of red blood cells.
 8. The isolated monoclonal antibody orimmunologically active fragment thereof of claim 1, wherein the isolatedmonoclonal antibody or immunologically active fragment thereof does notcause hemagglutination or depletion of red blood cells.
 9. An isolatedbispecific monoclonal antibody comprising a first arm and a second arm,wherein the first arm comprises a first monoclonal antibody orimmunologically active fragment thereof of claim 1 which binds humanCD47, and the second arm comprise a second monoclonal antibody that doesnot bind human CD47.
 10. The bispecific monoclonal antibody of claim 9,wherein the second arm binds to a cancer cell.
 11. The bispecificmonoclonal antibody of claim 9, wherein the bispecific monoclonalantibody inhibits interaction between human CD47 and human SIRPα. 12.(canceled)
 13. A method for treating a disease in a human subject inneed thereof, comprising administering to the subject a therapeuticallyeffective amount of an isolated monoclonal antibody or immunologicallyactive fragment thereof of claim 1; wherein the disease is cancer, afibrotic disease, a disease related to inhibition of phagocytosis, or adisease related to platelet aggregation.
 14. The method of claim 13,wherein the cancer is selected from the group consisting of: ovariancancer, colon cancer, breast cancer, lung cancer, head and neck cancer,bladder cancer, colorectal cancer, pancreatic cancer, non-Hodgkin'slymphoma, acute lymphocytic leukemia, chronic lymphocytic leukemia,acute myeloid leukemia, chronic myelogenous leukemia, hairy cellleukemia (HCL), T-cell prolymphocytic leukemia (T-PLL), large granularlymphocytic leukemia, adult T-cell leukemia, multiple myeloma, melanoma,leiomyoma, leiomyosarcoma, glioma, glioblastoma, myelomas, monocyticleukemias, B-cell derived leukemias, T-cell derived leukemias, B-cellderived lymphomas, T-cell derived lymphomas, endometrial cancer, kidneycancer, melanoma, prostate cancer, thyroid cancer, cervical cancer,gastric cancer, liver cancer, and solid tumors; the fibrotic disease isselected from the group consisting of: myocardial infarction, angina,osteoarthritis, pulmonary fibrosis, asthma, cystic fibrosis, bronchitis,and asthma; the disease related to inhibition of phagocytosis is acardiovascular disease; the disease related to platelet aggregation isGlanzmann Thrombasthenia, prolonged bleeding time, immunethrombocytopenia (ITP), von Willebrand disease (vWD).
 15. The method ofclaim 14, wherein the cardiovascular disease is selected from the groupconsisting of atherosclerosis, stroke, hypertensive heart disease,rheumatic heart disease, cardiomyopathy, heart arrhythmia, congenitalheart disease, valvular heart disease, carditis, aortic aneurysms,peripheral artery disease, and venous thrombosis.
 16. (canceled) 17.(canceled)
 18. (canceled)
 19. (canceled)
 20. (canceled)
 21. (canceled)22. (canceled)
 23. (canceled)
 24. (canceled)